Amin Arbabian

All Publications

• A Wireless Implantable Closed-Loop Electrochemical Drug Delivery System IEEE TRANSACTIONS ON BIOMEDICAL CIRCUITS AND SYSTEMS Wang, M. L., Yeon, P., Mofidfar, M., Chamberlayne, C., Xu, H., Annes, J. P., Zare, R. N., Arbabian, A. 2025; 19 (4): 777-790

  Abstract

  Wireless implantable drug delivery systems (DDSs) enable targeted, on-demand drug release to maximize therapeutic efficacy. Ultrasound has been proposed to wirelessly power and control millimeter-sized deeply implantable DDSs, but initial demonstrations encountered challenges in power transfer and release control reliability in dynamic in vivo environments. In this work, we present a closed-loop implantable DDS using ultrasound wireless power and communication in conjunction with an electrochemical drug release mechanism. The system consists of piezoelectric transducers for wireless power and data transmission, a drug delivery module containing drug-loaded electroresponsive nanoparticles, and a custom CMOS integrated circuit for closed-loop drug release using a programmable potentiostat capable of providing potentials up to $\boldsymbol{\pm}$1.5 V and sensing current up to $\boldsymbol{\pm}$100 $\boldsymbol{\mu}$A. The chip also improves power transfer robustness by enabling ultrasound power combining and rectifier voltage feedback which can be used to adapt the power transmitter and minimize misalignment. Closed-loop release control is tested in vitro using the wirelessly powered DDS at 8 cm depth by adjusting the potentiostat stimulus voltage based on feedback of redox current into fluorescein-loaded nanoparticles, resulting in consistent 2 $\boldsymbol{\mu}$g release across different fluorescein loading concentrations and a 39$\%$ reduction in release amount variation. These results demonstrate the effectiveness of closed-loop release control in enabling precise and reliable drug delivery.

  View details for DOI 10.1109/TBCAS.2024.3507022

  View details for Web of Science ID 001552877400001

  View details for PubMedID 40030289

• A W-Band TX/RX Chipset With 2.4-GHz LO Synchronization Enabling Full Scalability for FMCW Radar IEEE JOURNAL OF SOLID-STATE CIRCUITS Zhang, J., Ahmed, S. S., Arbabian, A. 2024

  View details for DOI 10.1109/JSSC.2024.3514667

  View details for Web of Science ID 001381488700001

• Birefringence-free photoelastic modulator with centimeter-square aperture operating at 2.7 MHz with sub-watt drive power OPTICS LETTERS Atalar, O., Arbabian, A. 2024; 49 (18): 5051-5054

  Abstract

  Photoelastic modulators are optical devices with a broad range of applications. These devices typically utilize a transverse interaction mechanism between acoustic and optical waves, resulting in a fundamental trade-off between the input aperture and the modulation frequency. Commercially available modulators with centimeter-square apertures have operating frequencies in the vicinity of 50 kHz. In this work, we experimentally demonstrate a birefringence-free photoelastic modulator operating at approximately 2.7 MHz with a centimeter-square aperture, increasing the operating frequency substantially compared to existing approaches. Using the modulator and polarizers, we demonstrate close to π radians polarization modulation amplitude with sub-watt drive power, translating to nearly 100% intensity modulation efficiency at the fundamental (2.7 MHz) and second-harmonic (5.4 MHz) frequencies.

  View details for DOI 10.1364/OL.533396

  View details for Web of Science ID 001317391100001

  View details for PubMedID 39270232

• Anchor-Based, Real-Time Motion Compensation for High-Resolution mmWave Radar IEEE JOURNAL OF MICROWAVES Poole, N., Arbabian, A. 2024

  View details for DOI 10.1109/JMW.2024.3399096

  View details for Web of Science ID 001230823800001

• Polarization-insensitive wide-angle resonant acousto-optic phase modulator OPTICS LETTERS Atalar, O., Arbabian, A. 2024; 49 (8): 2141-2144

  Abstract

  Phase modulators are commonly used devices in optics. Free-space phase modulators are typically constructed from optically anisotropic crystals exhibiting the Pockels effect. To preserve the light's polarization state as it propagates through the crystal, it is essential to align the polarization and the angle of incidence of the light with respect to the crystal. In this study, we demonstrate the feasibility of constructing free-space resonant phase modulators with a broad acceptance angle and minimal dependence on the polarization state of light using an acousto-optic approach. These modulators operate in the megahertz frequency range, require modest power levels, have aperture sizes exceeding 1 cm2, and feature sub-millimeter thickness.

  View details for DOI 10.1364/OL.514333

  View details for Web of Science ID 001246241900009

  View details for PubMedID 38621096

• CM-ASAP: Cross-Modality Adaptive Sensing and Perception for Efficient Hand Gesture Recognition Hor, S., El-Khamy, M., Zhou, Y., Arbabian, A., Lim, S., IEEE COMPUTER SOC IEEE COMPUTER SOC. 2024: 207-213

  View details for DOI 10.1109/MIPR62202.2024.00039

  View details for Web of Science ID 001343060900030

• Optically isotropic longitudinal piezoelectric resonant photoelastic modulator for wide angle polarization modulation at megahertz frequencies. Journal of the Optical Society of America. A, Optics, image science, and vision Atalar, O., Arbabian, A. 2023; 40 (12): 2249-2258

  Abstract

  Polarization modulators have a broad range of applications in optics. The acceptance angle of a free-space polarization modulator is crucial for many applications. Polarization modulators that can achieve a wide acceptance angle are constructed by attaching a piezoelectric transducer to an isotropic material, and utilizing a resonant transverse interaction between light and acoustic waves. Since their demonstration in the 1960s, the design of these modulators has essentially remained the same with minor improvements in the following decades. In this work, we show that a suitable single crystal with the correct crystal orientation, functioning as both the piezoelectric transducer and the acousto-optic interaction medium, could be used for constructing a highly efficient free-space resonant polarization modulator operating at megahertz frequencies and exhibiting a wide acceptance angle. We construct the modulator using gallium arsenide, an optically isotropic and piezoelectric crystal, and demonstrate polarization modulation at 6MHz with an input aperture of 1cm in diameter, acceptance angle reaching ±30∘, and modulation efficiency exceeding 50%. Compared to state-of-the-art resonant photoelastic modulators, the modulator reported in this work exhibits greater than 50-fold improvement in modulation frequency for the same input aperture, while simultaneously reducing the thickness by approximately a factor of 80. Increasing the modulation frequency of photoelastic modulators from the kilohertz to the megahertz regime and substantially reducing their thickness lead to significant performance improvements for various use cases. This technological advancement also creates opportunities for utilizing these devices in new applications.

  View details for DOI 10.1364/JOSAA.500167

  View details for PubMedID 38086033

• A 130-nm Fusion-Based Deconvolution Kernel Generator IC for Real-Time mmWave Radar Motion Compensation IEEE ACCESS Poole, N., Arbabian, A. 2023; 11: 132223-132238

  View details for DOI 10.1109/ACCESS.2023.3336408

  View details for Web of Science ID 001116095400001

• MVDoppler: Unleashing the Power of Multi-View Doppler for MicroMotion-Based Gait Classification Hor, S., Yang, S., Choi, J., Arbabian, A. edited by Oh, A., Neumann, T., Globerson, A., Saenko, K., Hardt, M., Levine, S. NEURAL INFORMATION PROCESSING SYSTEMS (NIPS). 2023

  View details for Web of Science ID 001229751902025

• Gut Microbiome Redox Sensors With Ultrasonic Wake-Up and Galvanic Coupling Wireless Links IEEE TRANSACTIONS ON BIOMEDICAL ENGINEERING Baltsavias, S., Van Treuren, W., Sawaby, A., Baker, S. W., Sonnenburg, J. L., Arbabian, A. 2023; 70 (1): 76-87

  Abstract

  Tools to measure in vivo redox activity of the gut microbiome and its influence on host health are lacking. In this paper, we present the design of new in vivo gut oxidation-reduction potential (ORP) sensors for rodents, to study host-microbe and microbe-environment interactions throughout the gut. These are the first in vivo sensors to combine ultrasonic wake-up and galvanic coupling telemetry, allowing for sensor miniaturization, experiment flexibility, and robust wireless measurements in live rodents. A novel study of in situ ORP along the intestine reveals biogeographical redox features that the ORP sensors can uniquely access in future gut microbiome studies.

  View details for DOI 10.1109/TBME.2022.3184972

  View details for Web of Science ID 000936179400008

  View details for PubMedID 35727787

  View details for PubMedCentralID PMC9911315

• A W-Band Spillover-Tolerant Mixer-First Receiver for FMCW Radars Zhang, J., Ahmed, S. S., Arbabian, A., IEEE IEEE. 2023: 241-244

  View details for Web of Science ID 001042340100060

• Y-Z cut lithium niobate longitudinal piezoelectric resonant photoelastic modulator OPTICS EXPRESS Atalar, O., Yee, S., Safavi-Naeini, A., Arbabian, A. 2022; 30 (26): 47103-47114

  Abstract

  The capability to modulate the intensity of an optical beam has scientific and practical significance. In this work, we demonstrate Y-Z cut lithium niobate acousto-optic modulators with record-high modulation efficiency, requiring only 1.5 W/cm2 for 100% modulation at 7 MHz. These modulators use a simple fabrication process; coating the top and bottom surfaces of a thin lithium niobate wafer with transparent electrodes. The fundamental shear acoustic mode of the wafer is excited through the transparent electrodes by applying voltage with frequency corresponding to the resonant frequency of this mode, confining an acoustic standing wave to the electrode region. Polarization of light propagating through this region is modulated at the applied frequency. Polarization modulation is converted to intensity modulation by placing the modulator between polarizers. To showcase an important application space for this modulator, we integrate it with a standard image sensor and demonstrate 4 megapixel time-of-flight imaging.

  View details for DOI 10.1364/OE.476970

  View details for Web of Science ID 000914755600002

  View details for PubMedID 36558647

• An RF-Ultrasound Relay for Adaptive Wireless Powering Across Tissue Interfaces. IEEE journal of solid-state circuits So, E., Yeon, P., Chichilnisky, E. J., Arbabian, A. 2022; 57 (11): 3429-3441

  Abstract

  Single modality wireless power transfer has limited depth for mm-sized implants across air / tissue or skull / tissue interfaces because they either suffer from high loss in tissue (RF, Optical) or high reflection at the medium interface (Ultrasound (US)). This paper proposes an RF-US relay chip at the media interface avoiding the reflection at the boundary, and enabling efficient wireless powering to mm-sized deep implants across multiple media. The relay chip rectifies the incoming RF power through an 85.5% efficient RF inductive link (across air) using a multi-output regulating rectifier (MORR) with 81% power conversion efficiency (PCE) at 186 mW load, and transmits ultrasound using adiabatic power amplifiers (PAs) to the implant in order to minimize cascaded power loss. To adapt the US focus to implant movement or placement, beamforming was implemented using 6 channels of US PAs with 2-bit phase control (0, 90, 180, and 270°) and 3 different amplitudes (6-29, 4.5, and 1.8 V) from the MORR. The adiabatic PA contributes a 30-40% increase in efficiency over class-D and beamforming increases the efficiency by 251% at 2.5 cm over fixed focusing. The proof-of-concept powering system for a retinal implant, from an external PA on a pair of glasses to a hydrophone with 1.2 cm (air) + 2.9 cm (agar eyeball phantom in mineral oil) separation distance, had a power delivered to the load (PDL) of 946 μW. The 2.3 × 2 mm2 relay chip was fabricated in a 180 nm high-voltage (HV) BCD process.

  View details for DOI 10.1109/jssc.2022.3171233

  View details for PubMedID 37138581

  View details for PubMedCentralID PMC10153624

• On-demand electrochemically controlled compound release from an ultrasonically powered implant. RSC advances Wang, M. L., Chamberlayne, C. F., Xu, H., Mofidfar, M., Baltsavias, S., Annes, J. P., Zare, R. N., Arbabian, A. 2022; 12 (36): 23337-23345

  Abstract

  On-demand drug delivery systems are promising for a wide range of therapeutic applications. When combined with wireless implants for controlled drug delivery, they can reduce overall dosage and side effects. Here, we demonstrate release of fluorescein from a novel on-demand release system for negatively charged compounds. The release system is based on a modified electroresponsive polypyrrole nanoparticulate film designed to minimize ion exchange with the stored compound - a major passive leakage mechanism. We further designed an ultrasonically powered mm-sized implant to electronically control the on-demand drug delivery system in vivo. Release kinetics are characterized both in vitro and in vivo in mice using fluorescein as a model drug, demonstrating the feasibility of wireless, controllable drug release using an ultrasonically powered implant.

  View details for DOI 10.1039/d2ra03422k

  View details for PubMedID 36090393

  View details for PubMedCentralID PMC9382542

• On-demand electrochemically controlled compound release from an ultrasonically powered implant RSC ADVANCES Wang, M. L., Chamberlayne, C. F., Xu, H., Mofidfar, M., Baltsavias, S., Annes, J. P., Zare, R. N., Arbabian, A. 2022; 12 (36): 23337-23345

  View details for DOI 10.1039/d2ra03422k

  View details for Web of Science ID 000841167500001

• An RF-Ultrasound Relay for Adaptive Wireless Powering Across Tissue Interfaces IEEE JOURNAL OF SOLID-STATE CIRCUITS So, E., Yeon, P., Chichilnisky, E. J., Arbabian, A. 2022

  View details for DOI 10.1109/JSSC.2022.3171233

  View details for Web of Science ID 000798183000001

• A Thermoacoustic Imaging System for Noninvasive and Nondestructive Root Phenotyping IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS Singhvi, A., Fitzpatrick, A., Scharwies, J., Dinneny, J. R., Arbabian, A. 2022; 69 (5): 2493-2497

  View details for DOI 10.1109/TCSII.2022.3159448

  View details for Web of Science ID 000790814000025

• Longitudinal piezoelectric resonant photoelastic modulator for efficient intensity modulation at megahertz frequencies. Nature communications Atalar, O., Van Laer, R., Safavi-Naeini, A. H., Arbabian, A. 2022; 13 (1): 1526

  Abstract

  Intensity modulators are an essential component in optics for controlling free-space beams. Many applications require the intensity of a free-space beam to be modulated at a single frequency, including wide-field lock-in detection for sensitive measurements, mode-locking in lasers, and phase-shift time-of-flight imaging (LiDAR). Here, we report a new type of single frequency intensity modulator that we refer to as a longitudinal piezoelectric resonant photoelastic modulator. The modulator consists of a thin lithium niobate wafer coated with transparent surface electrodes. One of the fundamental acoustic modes of the modulator is excited through the surface electrodes, confining an acoustic standing wave to the electrode region. The modulator is placed between optical polarizers; light propagating through the modulator and polarizers is intensity modulated with a wide acceptance angle and record breaking modulation efficiency in the megahertz frequency regime. As an illustration of the potential of our approach, we show that the proposed modulator can be integrated with a standard image sensor to effectively convert it into a time-of-flight imaging system.

  View details for DOI 10.1038/s41467-022-29204-9

  View details for PubMedID 35318321

• Multi-Watt-Level 4.9-GHz Silicon Power Amplifier for Portable Thermoacoustic Imaging IEEE JOURNAL OF SOLID-STATE CIRCUITS Sutardja, C., Singhvi, A., Fitzpatrick, A., Cathelin, A., Arbabian, A. 2022

  View details for DOI 10.1109/JSSC.2022.3149910

  View details for Web of Science ID 000764854600001

• A Data-Driven Waveform Adaptation Method for Mm-Wave Gait Classification at the Edge IEEE SIGNAL PROCESSING LETTERS Hor, S., Pilanci, M., Arbabian, A. 2022; 29: 26-30

  View details for DOI 10.1109/LSP.2021.3122355

  View details for Web of Science ID 000745491900006

• Laser Scanning for Single-Shot Frequency Diverse Photoacoustic Excitation Meng, W. L., Fitzpatrick, A., Singhvi, A., Arbabian, A., IEEE IEEE. 2022

  View details for DOI 10.1109/IUS54386.2022.9957210

  View details for Web of Science ID 000896080400025

• Adaptive Beamforming for Wireless Powering of a Network of Ultrasonic Implants Wang, M. L., Singhvi, A., Nyikayaramba, G., Murmann, B., Arbabian, A., IEEE IEEE. 2022

  View details for DOI 10.1109/IUS54386.2022.9958008

  View details for Web of Science ID 000896080400284

• Dynamic Tuning of Sensitivity and Bandwidth of High-Q Transducers via Nested Phase Modulations Fitzpatrick, A., Singhvi, A., Arbabian, A., IEEE IEEE. 2022: 876-880

  View details for DOI 10.1109/ISCAS48785.2022.9937917

  View details for Web of Science ID 000946638601017

• Single-Snapshot Pedestrian Gait Recognition at the Edge: A Deep Learning Approach to High-Resolution mmWave Sensing Hor, S., Poole, N., Arbabian, A., IEEE IEEE. 2022

  View details for DOI 10.1109/RADARCONF2248738.2022.9764196

  View details for Web of Science ID 000821555200057

• A 56 GS/s 8-bit 0.011 mm(2) 4x Delta-Interleaved Switched-Capacitor DAC in 16 nm FinFET CMOS Caragiulo, P., Ramkaj, A., Arbabian, A., Murmann, B., IEEE IEEE. 2022: 329-332

  View details for DOI 10.1109/ESSCIRC55480.2022.9911426

  View details for Web of Science ID 000886608500078

• A 2x Time-Interleaved 28-GS/s 8-Bit 0.03-mm(2) Switched-Capacitor DAC in 16-nm FinFET CMOS IEEE JOURNAL OF SOLID-STATE CIRCUITS Caragiulo, P., Mattia, O., Arbabian, A., Murmann, B. 2021; 56 (8): 2335-2346

  View details for DOI 10.1109/JSSC.2021.3057608

  View details for Web of Science ID 000678340400004

• CRADLE: Combined RF/Acoustic Detection and Localization of Passive Tags IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS I-REGULAR PAPERS Rekhi, A. S., So, E., Gural, A., Arbabian, A. 2021; 68 (6): 2555-2568

  View details for DOI 10.1109/TCSI.2021.3064990

  View details for Web of Science ID 000655248200023

• Effects of Reference Frequency Harmonic Spurs in FMCW Radar Systems Zhang, J., Ahmed, S. S., Arbabian, A., IEEE IEEE. 2021

  View details for DOI 10.1109/RadaraConf2147009.2021.9455280

  View details for Web of Science ID 000687846300138

• A Flexible Non-Radiative Dielectric Waveguide with a 1-dB Loss PCB-to-NRD Coupler for mm-Wave Array Applications Zhang, J., Arbabian, A., IEEE IEEE. 2021: 507-510

  View details for DOI 10.1109/IMS19712.2021.9574952

  View details for Web of Science ID 000852934400135

• A Real-Time, Frame-Level Platform Vibration Compensation Approach for mmWave Radar Systems Poole, N., Hor, S., Arbabian, A., IEEE IEEE. 2021: 181-184

  View details for Web of Science ID 000838709300045

• A Wireless Implantable Potentiostat for Programmable Electrochemical Drug Delivery IEEE Biomedical Circuits and Systems (BIOCAS) Wang, M. L., Yeon, P., Chamberlayne, C. F., Mofidfar, M., Xu, H., Annes, J. P., Zare, R. N., Arbabian, A. 2021

  View details for DOI 10.1109/BioCAS49922.2021.9644991

• Multi-Task Learning for Simultaneous Speed-of-Sound Mapping and Image Reconstruction Using Non-Contact Thermoacoustics Singhvi, A., Wang, M. L., Fitzpatrick, A., Arbabian, A., IEEE IEEE. 2021

  View details for DOI 10.1109/IUS52206.2021.9593748

  View details for Web of Science ID 000832095000405

• Design and Analysis of a Sample-and-Hold CMOS Electrochemical Sensor for Aptamer-Based Therapeutic Drug Monitoring IEEE JOURNAL OF SOLID-STATE CIRCUITS Chien, J., Baker, S. W., Soh, H., Arbabian, A. 2020; 55 (11): 2914–29

  View details for DOI 10.1109/JSSC.2020.3020789

  View details for Web of Science ID 000584274500007

• Design and Analysis of a Sample-and-Hold CMOS Electrochemical Sensor for Aptamer-based Therapeutic Drug Monitoring. IEEE journal of solid-state circuits Chien, J. C., Baker, S. W., Soh, H. T., Arbabian, A. 2020; 55 (11): 2914-2929

  Abstract

  In this paper, we present the design and the analysis of an electrochemical circuit for measuring the concentrations of therapeutic drugs using structure-switching aptamers. Aptamers are single-stranded nucleic acids, whose sequence is selected to exhibit high affinity and specificity toward a molecular target, and change its conformation upon binding. This property, when coupled with a redox reporter and electrochemical detection, enables reagent-free biosensing with a sub-minute temporal resolution for in vivo therapeutic drug monitoring. Specifically, we design a chronoamperometry-based electrochemical circuit that measures the direct changes in the electron transfer (ET) kinetics of a methylene blue reporter conjugated at the distal-end of the aptamer. To overcome the high-frequency noise amplification issue when interfacing with a large-size (> 0.25 mm2) implantable electrode, we present a sample-and-hold (S/H) circuit technique in which the desired electrode potentials are held onto noiseless capacitors during the recording of the redox currents. This allows disconnecting the feedback amplifiers to avoid its noise injection while reducing the total power consumption. A prototype circuit implemented in 65-nm CMOS demonstrates a cell-capacitance-insensitive input-referred noise (IRN) current of 15.2 pArms at a 2.5-kHz filtering bandwidth. We tested our system in human whole blood samples and measured the changes in the ET kinetics from the redox-labeled aptamers at different kanamycin concentrations. By employing principal component analysis (PCA) to compensate for the sampling errors, we report a molecular noise floor (at SNR = 1) of 3.1 µM with sub 1-sec acquisition time at 0.22-mW power consumption.

  View details for DOI 10.1109/jssc.2020.3020789

  View details for PubMedID 33343021

  View details for PubMedCentralID PMC7742970

• Inverse-designed non-reciprocal pulse router for chip-based LiDAR NATURE PHOTONICS Yang, K., Skarda, J., Cotrufo, M., Dutt, A., Ahn, G., Sawaby, M., Vercruysse, D., Arbabian, A., Fan, S., Alu, A., Vuckovic, J. 2020

  View details for DOI 10.1038/s41566-020-0606-0

  View details for Web of Science ID 000521525600003

• Time-of-flight imaging based on resonant photoelastic modulation (vol 58, pg 2235, 2019) APPLIED OPTICS Atalar, O., Van Laer, R., Sarabalis, C. J., Safavi-Naeini, A. H., Arbabian, A. 2020; 59 (5): 1430

  Abstract

  This publisher's note corrects the Funding section in Appl. Opt.58, 2235 (2019)APOPAI0003-693510.1364/AO.58.002235.

  View details for DOI 10.1364/AO.389202

  View details for Web of Science ID 000526522300059

  View details for PubMedID 32225397

• Assessment of miniaturized ultrasound-powered implants: an in vivo study. Journal of neural engineering Vo, J. n., Chang, T. C., Shea, K. I., Myers, M. R., Arbabian, A. n., Vasudevan, S. n. 2020

  Abstract

  Therapeutic applications of implantable active medical devices have improved the quality of patient life. Numerous on-going research in the field of neuromodulation and bioelectronics medicine are exploring the use of these implants for treating diseases and conditions. Miniaturized implantable medical devices that are wirelessly powered by ultrasound (US) can be placed close to the target sites deep inside the body for effective therapy with less invasiveness. In this study, we assessed the long-term in vivo performance of miniaturized US powered implants (UPI) using a rodent model.Prototype UPI devices were implanted in rodents and powered wirelessly using an unfocused US transmitter over 12 weeks, and the corresponding device output was recorded. Structural integrity of UPI before and after implantation was studied using scanning electron microscopy (SEM). We also conducted qualitative histological assessment of skin and muscle surrounding the UPI and compared it to naïve control and US exposed tissues.We found that it is feasible to power UPI devices wirelessly with US over long-term. The encapsulation of UPIs did not degrade over time and the tissues surrounding the UPI were comparable to both naïve control and US exposed tissues.This study is the first to assess the long-term performance of miniaturized UPI devices using a rodent model over 12-weeks. The set of tests used in this study can be extended to assess other US-powered miniaturized implants.

  View details for DOI 10.1088/1741-2552/ab6fc2

  View details for PubMedID 31978913

• Spatial Reconstruction of Soil Moisture Content using Non-Contact Thermoacoustic Imaging Fitzpatrick, A., Singhvi, A., Arbabian, A., IEEE IEEE. 2020

  View details for Web of Science ID 000646236300082

• A 10-Gbps Continuous-Time Linear Equalizer for mm-Wave Dielectric Waveguide Communication IEEE SOLID-STATE CIRCUITS LETTERS Mattia, O. E., Sawaby, M., Zheng, K., Arbabian, A., Murmann, B. 2020; 3: 266-269

  View details for DOI 10.1109/LSSC.2020.3014859

  View details for Web of Science ID 000723378200068

• Resolution Enhanced Non-Contact Thermoacoustic Imaging using Coded Pulse Excitation Singhvi, A., Fitzpatrick, A., Arbabian, A., IEEE IEEE. 2020

  View details for Web of Science ID 000635688900049

• An Airborne Sonar System for Underwater Remote Sensing and Imaging IEEE ACCESS Fitzpatrick, A., Singhvi, A., Arbabian, A. 2020; 8: 189945–59

  View details for DOI 10.1109/ACCESS.2020.3031808

  View details for Web of Science ID 000584877300001

• A Fully Integrated 32 Gbps 2x2 LoS MIMO Wireless Link with UWB Analog Processing for Point-to-Point Backhaul Applications Sawaby, M., Grave, B., Jany, C., Chen, C., Kananian, S., Calascibetta, P., Gianesello, F., Arbabian, A. edited by Hueber, G., Wang, H. IEEE. 2020: 107–10

  View details for Web of Science ID 000612019100027

• Lithium Niobate Resonant Photoelastic Modulator for Time-of-Flight Imaging Atalar, O., Van Laer, R., Sarabalis, C. J., Safavi-Naeini, A. H., Arbabian, A., IEEE IEEE. 2020

  View details for Web of Science ID 000612090001179

• A Cell-Capacitance-Insensitive CMOS Sample-and-Hold Chronoamperometric Sensor for Real-Time Measurement of Small Molecule Drugs in Whole Blood Chien, J., Soh, H., Arbabian, A., IEEE IEEE. 2020: 406-+

  View details for Web of Science ID 000570129800163

• A Compact 14 GS/s 8-bit Switched-Capacitor DAC in 16 nm FinFET CMOS Caragiulo, P., Mattia, O., Arbabian, A., Murmann, B., IEEE IEEE. 2020

  View details for Web of Science ID 000621657500004

• Design of Large Effective Apertures for Millimeter Wave Systems Using a Sparse Array of Subarrays IEEE TRANSACTIONS ON SIGNAL PROCESSING Gupta, A., Madhow, U., Arbabian, A., Sadri, A. 2019; 67 (24): 6483–97

  View details for DOI 10.1109/TSP.2019.2955828

  View details for Web of Science ID 000502992600022

• A Microwave-Induced Thermoacoustic Imaging System With Non-Contact Ultrasound Detection IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL Singhvi, A., Boyle, K. C., Fallahpour, M., Khuri-Yakub, B. T., Arbabian, A. 2019; 66 (10): 1587–99

  Abstract

  Portable and easy-to-use imaging systems are in high demand for medical, security screening, nondestructive testing, and sensing applications. We present a new microwave-induced thermoacoustic imaging system with non-contact, airborne ultrasound (US) detection. In this system, a 2.7 GHz microwave excitation causes differential heating at interfaces with dielectric contrast, and the resulting US signal via the thermoacoustic effect travels out of the sample to the detector in air at a standoff. The 65 dB interface loss due to the impedance mismatch at the air-sample boundary is overcome with high-sensitivity capacitive micromachined ultrasonic transducers with minimum detectable pressures (MDPs) as low as 278 μ Pa rms and we explore two different designs-one operating at a center frequency of 71 kHz and another at a center frequency of 910 kHz. We further demonstrate that the air-sample interface presents a tradeoff with the advantage of improved resolution, as the change in wave velocity at the interface creates a strong focusing effect alongside the attenuation, resulting in axial resolutions more than 10× smaller than that predicted by the traditional speed/bandwidth limit. A piecewise synthetic aperture radar (SAR) algorithm modified for US imaging and enhanced with signal processing techniques is used for image reconstruction, resulting in mm-scale lateral and axial image resolution. Finally, measurements are conducted to verify simulations and demonstrate successful system performance.

  View details for DOI 10.1109/TUFFC.2019.2925592

  View details for Web of Science ID 000489765500004

  View details for PubMedID 31251184

• On-demand drug release from polypyrrole nanoparticulate films Chamberlayne, C., Baltsavias, S., Xu, H., Arbabian, A., Annes, J., Zare, R. AMER CHEMICAL SOC. 2019

  View details for Web of Science ID 000525055501160

• MINI-SPECIAL ISSUE ON 2018 INTERNATIONAL WORKSHOP ON INTEGRATED NONLINEAR MICROWAVE AND MILLIMETRE-WAVE CIRCUITS IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES Arbabian, A. 2019; 67 (7): 2521–22

  View details for DOI 10.1109/TMTT.2019.2919357

  View details for Web of Science ID 000473597700008

• Chromatic Properties of Blood During Coagulation. Conference proceedings : ... Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual Conference Razavi, J., Arbabian, A. 2019; 2019: 4733–36

  Abstract

  This paper proposes a method of detecting blood clots by analyzing the chromatic properties of blood. Measurements are performed with a Basler camera on blood during coagulation to determine the changes in red, green, and blue (RGB) values. Results show that there is a significant change in the red value that can be exploited for real-time, early detection of blood clots.

  View details for DOI 10.1109/EMBC.2019.8856365

  View details for PubMedID 31946919

• Non-Invasive Remote Temperature Monitoring Using Microwave-Induced Thermoacoustic Imaging. Conference proceedings : ... Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual Conference Nan, H., Fitzpatrick, A., Wang, K., Arbabian, A. 2019; 2019: 6375–78

  Abstract

  Non-invasive temperature monitoring of tissue at depth in real-time is critical to hyperthermia therapies such as high-intensity focused ultrasound. Knowledge of temperature allows for monitoring treatment as well as providing real-time feedback to adjust deposited power in order to maintain safe and effective temperatures. Microwave-induced thermoacoustic (TA) imaging, which combines the conductivity/dielectric contrast of microwave imaging with the resolution of ultrasound, shows potential for estimating temperature non-invasively in real-time by indirectly measuring the temperature dependent parameters from reconstructed images. In this work, we study the temperature dependent behavior of the generated pressure in the TA effect and experimentally demonstrate simultaneous imaging and temperature monitoring using TA imaging. The proof-of-concept experiments demonstrate millimeter spatial resolution while achieving degree-level accuracy.

  View details for DOI 10.1109/EMBC.2019.8857309

  View details for PubMedID 31947301

• Ultrasonic Wake-Up With Precharged Transducers IEEE JOURNAL OF SOLID-STATE CIRCUITS Rekhi, A. S., Arbabian, A. 2019; 54 (5): 1475–86

  View details for DOI 10.1109/JSSC.2019.2892617

  View details for Web of Science ID 000466185400024

• Time-of-flight imaging based on resonant photoelastic modulation APPLIED OPTICS Atalar, O., Van Laer, R., Sarabalis, C. J., Safavi-Naeini, A. H., Arbabian, A. 2019; 58 (9): 2235–47

  View details for DOI 10.1364/AO.58.002235

  View details for Web of Science ID 000461903600013

• An Aptamer-based Electrochemical-Sensing Implant for Continuous Therapeutic-Drug Monitoring in vivo Chien, J., Mage, P. L., Soh, H., Arbabian, A., IEEE IEEE. 2019: C312–C313

  View details for Web of Science ID 000531736500107

• Ultrasonic Implant Localization for Wireless Power Transfer: Active Uplink and Harmonic Backscatter Wang, M. L., Chang, T., Arbabian, A., IEEE IEEE. 2019: 818–21

  View details for Web of Science ID 000510220100208

• Multi-Access Networking with Wireless Ultrasound-Powered Implants Chang, T., Wang, M., Arbabian, A., IEEE IEEE. 2019

  View details for Web of Science ID 000521751500114

• Chromatic Properties of Blood During Coagulation Razavi, J., Arbabian, A., IEEE IEEE. 2019: 4733–36

  View details for Web of Science ID 000557295305038

• Non-Invasive Remote Temperature Monitoring Using Microwave-Induced Thermoacoustic Imaging Nan, H., Fitzpatrick, A., Wang, K., Arbabian, A., IEEE IEEE. 2019: 6375–78

  View details for Web of Science ID 000557295306183

• Non-Contact Thermoacoustic Sensing and Characterization of Plant Root Traits Singhvi, A., Ma, B., Scharwies, J., Dinneny, J. R., Khuri-Yakub, B. T., Arbabian, A., IEEE IEEE. 2019: 1992–95

  View details for Web of Science ID 000510220100511

• In Vivo Wireless Sensors for Gut Microbiome Redox Monitoring. IEEE transactions on bio-medical engineering Baltsavias, S. n., Van Treuren, W. n., Weber, M. n., Charthad, J. n., Baker, S. n., Sonnenburg, J. L., Arbabian, A. n. 2019

  Abstract

  A perturbed gut microbiome has recently been linked with multiple disease processes, yet researchers currently lack tools that can provide in vivo, quantitative, and real-time insight into these processes and associated host-microbe interactions. We propose an in vivo wireless implant for monitoring gastrointestinal tract redox states using oxidation-reduction potentials (ORP). The implant is powered and conveniently interrogated via ultrasonic waves. We engineer the sensor electronics, electrodes, and encapsulation materials for robustness in vivo, and integrate them into an implant that endures autoclave sterilization and measures ORP for 12 days implanted in the cecum of a live rat. The presented implant platform paves the way for long-term experimental testing of biological hypotheses, offering new opportunities for understanding gut redox pathophysiology mechanisms, and facilitating translation to disease diagnosis and treatment applications.

  View details for DOI 10.1109/TBME.2019.2948575

  View details for PubMedID 31634824

• Beamforming Microwave-Induced Thermoacoustic Imaging for Screening Applications IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES Nan, H., Liu, S., Buckmaster, J., Arbabian, A. 2019; 67 (1): 464–74

  View details for DOI 10.1109/TMTT.2018.2880901

  View details for Web of Science ID 000455450200043

• Ultrasonic Implant Localization for Wireless Power Transfer: Active Uplink and Harmonic Backscatter. IEEE International Ultrasonics Symposium : [proceedings]. IEEE International Ultrasonics Symposium Wang, M. L., Chang, T. C., Arbabian, A. n. 2019; 2019: 818–21

  Abstract

  Efficient ultrasonic power transfer to implantable devices requires precise transmitter beamforming to the receiver and can quickly degrade with small changes in implant location. Ultrasound localization can be used to find and track implants in the body to maintain an efficient link. We present a framework to calculate localization accuracy showing that sub-mm accuracy is obtainable using only three receive channels. A harmonic backscatter approach, which passively provides contrast in the frequency domain without active load modulation is compared to active uplink from the implant. The localization accuracy using both active uplink and harmonic backscatter from the implant power receiver is characterized using a linear array probe. The measured location standard deviation is nearly two orders of magnitude smaller than the half-power beamwidth of the array focal spot. Finally, beamforming using the measured location information increases the available power by over 20 × compared to an unfocused beam.

  View details for PubMedID 31988699

• Multi-Access Networking with Wireless Ultrasound-Powered Implants. IEEE Biomedical Circuits and Systems Conference : healthcare technology : [proceedings]. IEEE Biomedical Circuits and Systems Conference Chang, T. C., Wang, M. n., Arbabian, A. n. 2019; 2019

  Abstract

  Multi-access networking with miniaturized wireless implantable devices can enable and advance closed-loop medical applications to deliver precise diagnosis and treatment. Using ultrasound (US) for wireless implant systems is an advantageous approach as US can beamform with high spatial resolution to efficiently power and address multiple implants in the network. To demonstrate these capabilities, we use wirelessly powered mm-sized implants with bidirectional communication links; uplink data communication measurements are performed using time, spatial, and frequency-division multiplexing schemes in tissue phantom. A 32-channel linear transmitter array and an external receiver are used as a base station to network with two implants that are placed 6.5 cm deep and spaced less than 1 cm apart. Successful wireless powering and uplink data communication around 100 kbps with a measured bit error rate below 10-4 are demonstrated for all three networking schemes, validating the multi-access networking feasibility of US wireless implant systems.

  View details for DOI 10.1109/BIOCAS.2019.8919144

  View details for PubMedID 31989118

• Communication With Crystal-Free Radios IEEE TRANSACTIONS ON COMMUNICATIONS Shaviv, D., Ozgur, A., Arbabian, A. 2018; 66 (10): 4513–20

  View details for DOI 10.1109/TCOMM.2018.2840713

  View details for Web of Science ID 000447853900012

• End-to-End Design of Efficient Ultrasonic Power Links for Scaling Towards Submillimeter Implantable Receivers IEEE TRANSACTIONS ON BIOMEDICAL CIRCUITS AND SYSTEMS Chang, T., Weber, M. J., Charthad, J., Baltsavias, S., Arbabian, A. 2018; 12 (5): 1100–1111

  Abstract

  We present an analytical framework for optimizing the efficiency of ultrasonic wireless power links for implantable devices scaled down to sub-mm dimensions. Key design insights and tradeoffs are considered for various parameters including the operating frequency, the transmission depth, the size of the transmitter, the impedance and the aperture efficiency of the miniaturized receiver, and the interface between the receiver and the power recovery chain on the implant. The performance of spherically focused transducers as ultrasonic transmitters is analyzed to study the limits and the tradeoffs. Two optimization methods are presented: "Focal Peak" sets the focus of transducers at target depths, and "Global Maximum" maximizes the efficiency globally with off-focus operation. The results are also compared to phased array implementations. To investigate the efficiency of implants, miniaturized receivers made from single crystalline piezoelectric material, PMN-PT, are used as they have resonances in the derived optimal carrier frequency range (∼1-2 MHz). A methodology to achieve an efficient interface to the power electronics is then provided using an optogenetic stimulator as an example platform. The analytical results are verified through both simulations and measurements. Finally, an example ultrasonic link using a spherical transmitter with a radius of 2 cm is demonstrated; link efficiencies of 1.93-0.23% are obtained at 6-10 cm depths with sub-mm receivers for the optogenetic application.

  View details for DOI 10.1109/TBCAS.2018.2871470

  View details for Web of Science ID 000448529300001

  View details for PubMedID 30235147

• Long-term in vivo performance of novel ultrasound powered implantable devices. Conference proceedings : ... Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual Conference Kang, C., Chang, T. C., Vo, J., Charthad, J., Weber, M., Arbabian, A., Vasudevan, S. 2018; 2018: 2985–88

  Abstract

  Neuromodulation devices have been approved for the treatment of epilepsy and seizures, with many other applications currently under research investigation. These devices rely on implanted battery powered pulse generators, that require replacement over time. Miniaturized ultrasound powered implantable devices have the potential to eliminate the need for batteries in neuromodulation devices. While these devices have been assessed in vitro, long-term in vivo assessment is required to determine device safety and performance. In this study, we developed a multi-stage long-term test platform to assess the performance of miniaturized ultrasound powered implantable devices.

  View details for DOI 10.1109/EMBC.2018.8512978

  View details for PubMedID 30441025

• Thermal analysis of ultrasound-powered miniaturized implants: A tissue-phantom study. The Journal of the Acoustical Society of America Walden, C., Soneson, J., Weber, M. J., Charthad, J., Chia Chang, T., Arbabian, A., Myers, M. 2018; 143 (6): 3373

  Abstract

  Neurological implants that harvest ultrasound power have the potential to provide long-term stimulation without complications associated with battery power. An important safety question associated with long-term operation of the implant involves the heat generated by the interaction of the device with the ultrasound field. A study was performed in which the temperature rise generated by this interaction was measured. Informed by temperature data from thermocouples outside the ultrasound beam, a mathematical inverse method was used to determine the volume heat source generated by ultrasound absorption within the implant as well as the surface heat source generated within the viscous boundary layer on the surface of the implant. For the test implant used, it was determined that most of the heat was generated in the boundary layer, giving a maximum temperature rise 5 times that for absorption in an equivalent volume of soft tissue. This result illustrates that thermal safety guidelines based solely on ultrasound absorption of tissue alone are not sufficient. The method presented represents an alternative approach for quantifying ultrasound thermal effects in the presence of implants. The analysis shows a steady temperature rise of about 0.2°C for every 100 mW/cm2 for the presented test implant.

  View details for PubMedID 29960486

• Thermal analysis of ultrasound-powered miniaturized implants: A tissue-phantom study JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA Walden, C., Soneson, J., Weber, M. J., Charthad, J., Chang, T., Arbabian, A., Myers, M. 2018; 143 (6): 3373-3382

  View details for DOI 10.1121/1.5040470

  View details for Web of Science ID 000437036000030

• A mm-Sized Wireless Implantable Device for Electrical Stimulation of Peripheral Nerves IEEE TRANSACTIONS ON BIOMEDICAL CIRCUITS AND SYSTEMS Charthad, J., Chang, T., Liu, Z., Sawaby, A., Weber, M. J., Baker, S., Gore, F., Felt, S. A., Arbabian, A. 2018; 12 (2): 257–70

  Abstract

  A wireless electrical stimulation implant for peripheral nerves, achieving >10× improvement over state of the art in the depth/volume figure of merit, is presented. The fully integrated implant measures just 2 mm × 3 mm × 6.5 mm (39 mm3, 78 mg), and operates at a large depth of 10.5 cm in a tissue phantom. The implant is powered using ultrasound and includes a miniaturized piezoelectric receiver (piezo), an IC designed in 180 nm HV BCD process, an off-chip energy storage capacitor, and platinum stimulation electrodes. The package also includes an optional blue light-emitting diode for potential applications in optogenetic stimulation in the future. A system-level design strategy for complete operation of the implant during the charging transient of the storage capacitor, as well as a unique downlink command/data transfer protocol, is presented. The implant enables externally programmable current-controlled stimulation of peripheral nerves, with a wide range of stimulation parameters, both for electrical (22 to 5000 μA amplitude, ∼14 to 470 μs pulse-width, 0 to 60 Hz repetition rate) and optical (up to 23 mW/mm2 optical intensity) stimulation. Additionally, the implant achieves 15 V compliance voltage for chronic applications. Full integration of the implant components, end-to-end in vitro system characterizations, and results for the electrical stimulation of a sciatic nerve, demonstrate the feasibility and efficacy of the proposed stimulator for peripheral nerves.

  View details for DOI 10.1109/TBCAS.2018.2799623

  View details for Web of Science ID 000428547600001

  View details for PubMedID 29578414

• A Miniaturized Single-Transducer Implantable Pressure Sensor With Time-Multiplexed Ultrasonic Data and Power Links Weber, M. J., Yoshihara, Y., Sawaby, A., Charthad, J., Chang, T., Arbabian, A. IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC. 2018: 1089–1101

  View details for DOI 10.1109/JSSC.2017.2782086

  View details for Web of Science ID 000428676100014

• A mm-sized wireless implantable device for electrical stimulation of peripheral nerves IEEE Trans. Biomedical Circuits and Systems Charthad, J. 2018
• A Dual-Element VNA Electronic Calibration in CMOS Chien, J., Arbabian, A., Niknejad, A. M., IEEE IEEE. 2018: 71–74

  View details for Web of Science ID 000458440200021

• A Single-Element VNA Electronic Calibration in CMOS Chien, J., Arbabian, A., Niknejad, A. M., IEEE IEEE. 2018: 1304–7

  View details for Web of Science ID 000451173600344

• A Programmable RF Transmitter for Wideband Thermoacoustic Spectroscopic Imaging Nan, H., Arbabian, A., IEEE IEEE. 2018: 1405–8

  View details for Web of Science ID 000451173600371

• Array Location Uncertainty in Imaging Radar: SAR vs. MIMO-SAR Mamandipoor, B., Teisberg, T., Kananian, S., Arbabian, A., IEEE IEEE. 2018: 150–53

  View details for Web of Science ID 000467992900038

• A 14.5mm(2) 8nW-59.7dBm-Sensitivity Ultrasonic Wake-Up Receiver for Power-, Area-, and Interference-Constrained Applications Rekhi, A., Arbabian, A., IEEE IEEE. 2018: 454-+

  View details for Web of Science ID 000459205600189

• A 14.5mm(2) 8nW-59.7dBm-Sensitivity Ultrasonic Wake-Up Receiver for Power-, Area-, and Interference-Constrained Applications Rekhi, A., Arbabian, A., IEEE IEEE. 2018

  View details for Web of Science ID 000432256300188

• Wireless Data Links for Next-Generation Networked Micro-Implantables Wang, M. L., Baltsavias, S., Chang, T., Weber, M. J., Charthad, J., Arbabian, A., IEEE IEEE. 2018

  View details for Web of Science ID 000434207400090

• Microwave-Induced Thermoacoustic Imaging of Subcutaneous Vasculature With Near-Field RF Excitation IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES Aliroteh, M. S., Arbabian, A. 2018; 66 (1): 577–88

  View details for DOI 10.1109/TMTT.2017.2714664

  View details for Web of Science ID 000419544200052

• A miniaturized single-transducer implantable pressure sensor with time-multiplexed ultrasonic data and power links IEEE J. Solid-State Circuits Weber, M., Yoshihara, Y., Sawaby, A., Charthad, J., Chang, T., Arbabian, A. 2018
• Ball Grid Array Module With Integrated Shaped Lens for 5G Backhaul/Fronthaul Communications in F-Band IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION Bisognin, A., Nachahe, N., Luxey, C., Gianesello, F., Gloria, D., Costa, J. R., Fernandes, C. A., Alvarez, Y., Arboleya-Arboleya, A., Laviada, J., Las-Heras, F., Dolatsha, N., Grave, B., Sawaby, M., Arbabian, A. 2017; 65 (12): 6380–94

  View details for DOI 10.1109/TAP.2017.2755439

  View details for Web of Science ID 000417885000019

• Wireless Power Transfer to Millimeter-Sized Nodes Using Airborne Ultrasound IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL Rekhi, A. S., Khuri-Yakub, B. T., Arbabian, A. 2017; 64 (10): 1526–41

  Abstract

  We propose the use of airborne ultrasound for wireless power transfer to mm-sized nodes, with intended application in the next generation of the Internet of Things (IoT). We show through simulation that ultrasonic power transfer can deliver 50 [Formula: see text] to a mm-sized node 0.88 m away from a ~ 50-kHz, 25-cm2 transmitter array, with the peak pressure remaining below recommended limits in air, and with load power increasing with transmitter area. We report wireless power recovery measurements with a precharged capacitive micromachined ultrasonic transducer, demonstrating a load power of 5 [Formula: see text] at a simulated distance of 1.05 m. We present aperture efficiency, dynamic range, and bias-free operation as key metrics for the comparison of transducers meant for wireless power recovery. We also argue that long-range wireless charging at the watt level is extremely challenging with existing technology and regulations. Finally, we compare our acoustic powering system with cutting edge electromagnetically powered nodes and show that ultrasound has many advantages over RF as a vehicle for power delivery. Our work sets the foundation for further research into ultrasonic wireless power transfer for the IoT.

  View details for DOI 10.1109/TUFFC.2017.2737620

  View details for Web of Science ID 000412634700010

  View details for PubMedID 28796616

• Exploiting spatial degrees of freedom for high data rate ultrasound communication with implantable devices APPLIED PHYSICS LETTERS Wang, M. L., Arbabian, A. 2017; 111 (13)

  View details for DOI 10.1063/1.5004967

  View details for Web of Science ID 000412074000042

• Peak-Power-Limited Frequency-Domain Microwave-Induced Thermoacoustic Imaging for Handheld Diagnostic and Screening Tools IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES Nan, H., Arbabian, A. 2017; 65 (7): 2607-2616

  View details for DOI 10.1109/TMTT.2016.2637909

  View details for Web of Science ID 000405006300037

• Remote sub-wavelength focusing of ultrasonically activated Lorentz current APPLIED PHYSICS LETTERS Rekhi, A. S., Arbabian, A. 2017; 110 (16)

  View details for DOI 10.1063/1.4981906

  View details for Web of Science ID 000399984200068

• Capsule Ultrasound Device: Characterization and Testing Results Wang, J., Memon, F., Touma, G., Baltsavias, S., Jang, J., Chang, C., Rasmussen, M., Olcott, E., Jeffrey, R., Arbabian, A., Khuri-Yakub, B. T., IEEE IEEE. 2017

  View details for Web of Science ID 000416948401038

• A Compact 130GHz Fully Packaged Point-to-Point Wireless System with 3D-Printed 26dBi Lens Antenna Achieving 12.5Gb/s at 1.55pJ/b/m Dolatsha, N., Grave, B., Sawaby, M., Chen, C., Babveyh, A., Kananian, S., Bisognin, A., Luxey, C., Gianesello, F., Costa, J., Fernandes, C., Arbabian, A., IEEE IEEE. 2017: 306

  View details for Web of Science ID 000403393800127

• A 30.5mm(3) Fully Packaged Implantable Device with Duplex Ultrasonic Data and Power Links Achieving 95kb/s with < 10(-4) BER at 8.5cm Depth Chang, T., Wang, M. L., Charthad, J., Weber, M. J., Arbabian, A., IEEE IEEE. 2017: 460

  View details for Web of Science ID 000403393800194

• The power of sound: miniaturized medical implants with ultrasonic links Wang, M. L., Chang, T., Charthad, J., Weber, M. J., Arbabian, A. edited by George, T., Dutta, A. K., Islam, M. S. SPIE-INT SOC OPTICAL ENGINEERING. 2017

  View details for DOI 10.1117/12.2263877

  View details for Web of Science ID 000411756000020

• Communication with Crystal-Free Radios Shaviv, D., Ozgur, A., Arbabian, A., IEEE IEEE. 2017

  View details for Web of Science ID 000428054301151

• Closed-Loop Ultrasonic Power and Communication with Multiple Miniaturized Active Implantable Medical Devices Wang, M. L., Chang, T., Teisberg, T., Weber, M. J., Charthad, J., Arbabian, A., IEEE IEEE. 2017

  View details for Web of Science ID 000416948401052

• A High-Precision 36 mm(3) Programmable Implantable Pressure Sensor with Fully Ultrasonic Power-up and Data Link Weber, M. J., Yoshihara, Y., Sawaby, A., Charthad, J., Chang, T., Garland, R., Arbabian, A., IEEE IEEE. 2017: C104–C105

  View details for Web of Science ID 000428759000042

• Sound Technologies, Sound Bodies IEEE MICROWAVE MAGAZINE Arbabian, A., Chang, T. C., Wang, M. L., Charthad, J., Baltsavias, S., Fallahpour, M., Weber, M. J. 2016; 17 (12): 39-54

  View details for DOI 10.1109/MMM.2016.2608638

  View details for Web of Science ID 000388892900008

• Design of Tunable Ultrasonic Receivers for Efficient Powering of Implantable Medical Devices With Reconfigurable Power Loads IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL Chang, T. C., Weber, M. J., Wang, M. L., Charthad, J., Khuri-Yakub, B. (., Arbabian, A. 2016; 63 (10): 1554-1562

  Abstract

  Miniaturized ultrasonic receivers are designed for efficient powering of implantable medical devices with reconfigurable power loads. Design parameters that affect the efficiency of these receivers under highly variable load conditions, including piezoelectric material, geometry, and operation frequency, are investigated. Measurements were performed to characterize electrical impedance and acoustic-to-electrical efficiency of ultrasonic receivers for off-resonance operation. Finally, we propose, analyze, and demonstrate adaptive matching and frequency tuning techniques using two different reconfigurable matching networks for typical implant loads from 10 [Formula: see text] to 1 mW. Both simulations and measurements show a significant increase in total implant efficiency (up to 50 percentage points) over this load power range when operating off-resonance with the proposed matching networks.

  View details for DOI 10.1109/TUFFC.2016.2606655

  View details for Web of Science ID 000385720000008

  View details for PubMedID 27623580

• Loss and Dispersion Limitations in mm-Wave Dielectric Waveguides for High-Speed Links IEEE TRANSACTIONS ON TERAHERTZ SCIENCE AND TECHNOLOGY Dolatsha, N., Chen, C., Arbabian, A. 2016; 6 (4): 637-640

  View details for DOI 10.1109/TTHZ.2016.2574326

  View details for Web of Science ID 000384913500016

• System-Level Analysis of Far-Field Radio Frequency Power Delivery for mm-Sized Sensor Nodes IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS I-REGULAR PAPERS Charthad, J., Dolatsha, N., Rekhi, A., Arbabian, A. 2016; 63 (2): 300-311

  View details for DOI 10.1109/TCSI.2015.2512720

  View details for Web of Science ID 000372751000013

• Capsule Ultrasound Device: Further Developments Memon, F., Touma, G., Wang, J., Baltsavias, S., Moini, A., Chang, C., Rasmussen, M., Nikoozadeh, A., Choe, J., Olcott, E., Jeffrey, R., Arbabian, A., Khuri-Yakub, B. T., IEEE IEEE. 2016

  View details for Web of Science ID 000387497400478

• Spatially Interleaved Architecture for High-Frequency Data Converters Grave, B., Arbabian, A., IEEE IEEE. 2016: 1450-1453

  View details for Web of Science ID 000390094701152

• Extracting Dielectric Spectroscopic Properties from Microwave-Induced Thermoacoustic Signals Liu, S., Nan, H., Dolatsha, N., Arbabian, A. edited by Patton, J., Barbieri, R., Ji, J., Jabbari, E., Dokos, S., Mukkamala, R., Guiraud, D., Jovanov, E., Dhaher, Y., Panescu, D., Vangils, M., Wheeler, B., Dhawan, A. P. IEEE. 2016: 3618-3621

  Abstract

  Available data on the dielectric properties of biological tissue across a frequency range adds an extra degree of freedom of contrast besides the baseline structural information obtained by conventional imaging techniques. In this paper, we propose a new methodology to non-invasively extract the normalized effective conductivity of samples over a large frequency range using microwave-induced thermoacoustic (TA) signals. Additionally, a calibration approach has been adopted to remove the frequency dependency of the experimental setup errors as well as the RF power variation. The linear relationship between the TA signal amplitude on the absorbed microwave power is used to extract the properties of samples. Saline phantoms with various concentration are used to mimic different tissue materials in the proof-of-concept experiment. The extracted normalized effective conductivity by the proposed method matches the theoretical calculations as well as the direct contact measurements by a dielectric probe.

  View details for Web of Science ID 000399823503238

  View details for PubMedID 28269078

• Microwave-Induced Thermoacoustic Tomography for Subcutaneous Vascular Imaging Aliroteh, M., Nan, H., Arbabian, A., IEEE IEEE. 2016

  View details for Web of Science ID 000387497400270

• Fast Iterative Reconstruction Algorithm for Microwave-Induced Thermoacoustic Imaging Nan, H., Haghi, B., Aliroteh, M. S., Fallahpour, M., Arbabian, A., IEEE IEEE. 2016: 1-4

  View details for Web of Science ID 000401795900001

• Analog Processing to Enable Scalable High-Throughput mm-Wave Wireless Fiber Systems Sawaby, M., Mamandipoor, B., Madhow, U., Arbabian, A. edited by Matthews, M. B. IEEE COMPUTER SOC. 2016: 1658-1662

  View details for Web of Science ID 000406057400292

• Standoff Tracking of Medical Interventional Devices using Non-Contact Microwave Thermoacoustic Detection Alexopoulos, G., Boyle, K. C., Dolatsha, N., Nan, H., Khuri-Yakub, B. T., Arbabian, A., IEEE IEEE. 2016

  View details for Web of Science ID 000390313200204

• Noncontact thermoacoustic detection of targets embedded in dispersive media Boyle, K. C., Nan, H., Khuri-Yakub, B. T., Arbabian, A. edited by Kamerman, G., Steinvall, O. SPIE-INT SOC OPTICAL ENGINEERING. 2016

  View details for DOI 10.1117/12.2241941

  View details for Web of Science ID 000391299100014

• A Miniaturized Ultrasonically Powered Programmable Optogenetic Implant Stimulator System Weber, M. J., Bhat, A., Chang, T., Charthad, J., Arbabian, A., IEEE IEEE. 2016: 12–14

  View details for Web of Science ID 000381808900004

• An Ultrasonically Powered Implantable Device for Targeted Drug Delivery Charthad, J., Baltsavias, S., Samanta, D., Chang, T., Weber, M. J., Hosseini-Nassab, N., Zare, R. N., Arbabian, A. edited by Patton, J., Barbieri, R., Ji, J., Jabbari, E., Dokos, S., Mukkamala, R., Guiraud, D., Jovanov, E., Dhaher, Y., Panescu, D., Vangils, M., Wheeler, B., Dhawan, A. P. IEEE. 2016: 541–44

  Abstract

  A wirelessly powered implantable device is proposed for fully programmable and localized drug delivery. The implant is powered using an external ultrasonic transmitter and operates at <; 5% of the FDA diagnostic ultrasound intensity limit. Drug release is achieved through electrical stimulation of drug-loaded polypyrrole nanoparticles. A design methodology for the implant electronics is presented and experimentally demonstrated to be accurate in predicting the concentration of the released drug. To the best of our knowledge, this is the first ultrasonically powered implantable device platform for targeted drug delivery using electroresponsive polymers. The active area of the implant electronics is just 3 mm × 5 mm.

  View details for Web of Science ID 000399823500133

  View details for PubMedID 28324933

• Fully packaged millimetre-wave dielectric waveguide with multimodal excitation ELECTRONICS LETTERS Dolatsha, N., Saiz, N., Arbabian, A. 2015; 51 (17): 1339-1340

  View details for DOI 10.1049/el.2015.2306

  View details for Web of Science ID 000359725300021

• A mm-Sized Implantable Medical Device (IMD) With Ultrasonic Power Transfer and a Hybrid Bi-Directional Data Link IEEE JOURNAL OF SOLID-STATE CIRCUITS Charthad, J., Weber, M. J., Chang, T. C., Arbabian, A. 2015; 50 (8): 1741-1753

  View details for DOI 10.1109/JSSC.2015.2427336

  View details for Web of Science ID 000358618500002

• A Power-Harvesting Pad-Less Millimeter-Sized Radio IEEE JOURNAL OF SOLID-STATE CIRCUITS Tabesh, M., Dolatsha, N., Arbabian, A., Niknejad, A. M. 2015; 50 (4): 962-977

  View details for DOI 10.1109/JSSC.2014.2384034

  View details for Web of Science ID 000352156000013

• Non-contact thermoacoustic detection of embedded targets using airborne-capacitive micromachined ultrasonic transducers APPLIED PHYSICS LETTERS Nan, H., Boyle, K. C., Apte, N., Aliroteh, M. S., Bhuyan, A., Nikoozadeh, A., Khuri-Yakub, B. T., Arbabian, A. 2015; 106 (8)

  View details for DOI 10.1063/1.4909508

  View details for Web of Science ID 000350546600091

• Capsule Ultrasound Device Memon, F., Touma, G., Wang, J., Baltsavias, S., Moini, A., Chang, C., Rasmussen, M., Nikoozadeh, A., Choe, J., Arbabian, A., Jeffrey, R., Olcott, E., Khuri-Yakub, B. T., IEEE IEEE. 2015

  View details for DOI 10.1109/ULTSYM.2015.0168

  View details for Web of Science ID 000366045700461

• Interferogram-Based Breast Tumor Classification Using Microwave-Induced Thermoacoustic Imaging Nan, H., Haghi, B., Arbabian, A., IEEE IEEE. 2015: 2717-2720

  Abstract

  Microwave-induced thermoacoustic (TA) imaging combines the dielectric/conductivity contrast in the microwave range with the high resolution of ultrasound imaging. Lack of ionizing radiation exposure in TA imaging makes this technique suitable for frequent screening applications, as with breast cancer screening. In this paper we demonstrate breast tumor classification based on TA imaging. The sensitivity of the signal-based classification algorithm to errors in the estimation of tumor locations is investigated. To reduce this sensitivity, we propose to use the interferogram of received pressure waves as the feature basis used for classification, and demonstrate the robustness based on a finite-difference time-domain (FDTD) simulation framework.

  View details for Web of Science ID 000371717202245

  View details for PubMedID 26736853

• Non-Contact Thermoacoustic Imaging of Tissue with Airborne Ultrasound Detection Boyle, K. C., Nan, H., Apte, N., Unlugedik, A., Aliroteh, M. S., Bhuyan, A., Nikoozadeh, A., Khuri-Yakub, B. T., Arbabian, A., IEEE IEEE. 2015

  View details for DOI 10.1109/ULTSYM.2015.0264

  View details for Web of Science ID 000366045700441

• Design of High-Efficiency Miniaturized Ultrasonic Receivers for Powering Medical Implants with Reconfigurable Power Levels Chang, T., Weber, M., Charthad, J., Nikoozadeh, A., Khuri-Yakub, P. T., Arbabian, A., IEEE IEEE. 2015

  View details for DOI 10.1109/ULTSYM.2015.0215

  View details for Web of Science ID 000366045700535

• Stepped-frequency continuous-wave microwave-induced thermoacoustic imaging APPLIED PHYSICS LETTERS Nan, H., Arbabian, A. 2014; 104 (22)

  View details for DOI 10.1063/1.4879841

  View details for Web of Science ID 000337161700093

• Frequency-modulated magneto-acoustic detection and imaging ELECTRONICS LETTERS Aliroteh, M. S., Scott, G., Arbabian, A. 2014; 50 (11): 790-791

  View details for DOI 10.1049/el.2014.0997

  View details for Web of Science ID 000337911200006

• mm-Wave Silicon: Smarter, Faster, and Cheaper Communication and Imaging. Frequency References, Power Management for SoC, and Smart Wireless Interfaces Niknejad, Ali, M., Arbabian, A., Callender, S., Chen, J., Chien, J., Kang, S. Springer International Publishing. 2014: 281–295
• A Compact Nonlinear-Transmission-Line-Based mm-Wave SFCW Imaging Radar Noujeim, K., Malysa, G., Babveyh, A., Arbabian, A., IEEE IEEE. 2014: 1766-1769

  View details for Web of Science ID 000392912200432

• A Compact Nonlinear-Transmission-Line-Based mm-Wave SFCW Imaging Radar Noujeim, K., Malysa, G., Babveyh, A., Arbabian, A., IEEE IEEE. 2014: 463-466

  View details for Web of Science ID 000361020600112

• Coherent Frequency-Domain Microwave-Induced Thermoacoustic Imaging Nan, H., Arbabian, A., IEEE IEEE. 2014

  View details for Web of Science ID 000363283700249

• A power-harvesting pad-less mm-sized 24/60GHz passive radio with on-chip antennas IEEE VLSI Circuits Symposium Tabesh, M. 2014

  View details for DOI 10.1109/VLSIC.2014.6858380

• Segmentation and Artifact Removal in Microwave-Induced Thermoacoustic Imaging 36th Annual International Conference of the IEEE-Engineering-in-Medicine-and-Biology-Society (EMBC) Nan, H., Chou, T., Arbabian, A. IEEE. 2014: 4747–4750

  Abstract

  Microwave-induced thermoacoustic (TA) imaging combines the soft-tissue dielectric contrast of microwave excitation with the resolution of ultrasound for the goal of a safe, high resolution, and possibly portable imaging technique. However, the hybrid nature of this method introduces new image-reconstruction challenges in enabling sufficient accuracy and segmentation. In this paper, we propose a segmentation technique based on the polarity characteristic of TA signals. A wavelet analysis based method is proposed to identify reflection artifacts as well. The time-frequency feature of the signal is used to assist differentiating artifacts. Ex vivo verification with experimental data is also provided.

  View details for Web of Science ID 000350044704184

  View details for PubMedID 25571053

• A 135GHz SiGe Transmitter With A Dielectric Rod Antenna-In-Package For High EIRP/Channel Arrays 36th Annual IEEE Custom Integrated Circuits Conference (CICC) - The Showcase for Integrated Circuit Design in the Heart of Silicon Valley Saiz, N., Dolatsha, N., Arbabian, A. IEEE. 2014

  View details for Web of Science ID 000349122300144

• A mm-Sized Implantable Device with Ultrasonic Energy Transfer and RF Data Uplink for High-Power Applications 36th Annual IEEE Custom Integrated Circuits Conference (CICC) - The Showcase for Integrated Circuit Design in the Heart of Silicon Valley Charthad, J., Weber, M. J., Chang, T. C., Saadat, M., Arbabian, A. IEEE. 2014

  View details for Web of Science ID 000349122300093

• A 94 GHz mm-Wave-to-Baseband Pulsed-Radar Transceiver with Applications in Imaging and Gesture Recognition Symposium on VLSI Circuits held its 26th Meeting on State-of-the-Art Topics important to VLSI Circuit and System Designers, as well as Device and Process Technology Experts Arbabian, A., Callender, S., Kang, S., Rangwala, M., Niknejad, A. M. IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC. 2013: 1055–71

  View details for DOI 10.1109/JSSC.2013.2239004

  View details for Web of Science ID 000316810500017

• Analysis and Design of a Multi-mode Dielectric Waveguide Interconnect with Planar Excitation Dolatsha, N., Arbabian, A. 2013
• Analysis and Design of Multi-mode Dielectric Waveguide Interconnect with Planar Excitation Dolatsha, N., Arbabian, A., Electromagnet Acad ELECTROMAGNETICS ACAD. 2013: 234-239

  View details for Web of Science ID 000361384200047

• Dielectric Waveguide with Planar Multi-Mode Excitation for High Data-Rate Chip-to-Chip Interconnects Dolatsha, N., Arbabian, A. 2013
• A Three-Stage Cascaded Distributed Amplifier with GBW Exceeding 1.5THz IEEE Radio Frequency Integrated Circuits Symposium (RFIC) Arbabian, A., Niknejad, A. 2012: 211-214
• A 94GHz mm-wave to baseband pulsed-radar for imaging and gesture recognition. In VLSI Circuits (VLSIC) Arbabian, A., Kang, S., Callender, S., Chien, J., Afshar, B., Niknejad, A. 2012: 56-57
• 60GHz Low-Loss Compact Phase Shifters Using A Lumped Element Hybrid CICC Tabesh, M., Arbabian, A., Niknejad, A. 2011
• Time-Domain Ultra-Wideband Synthetic Imager (TUSI) in Silicon 33rd Annual International Conference of the IEEE Engineering-in-Medicine-and-Biology-Society (EMBS) Arbabian, A., Niknejad, A. M. IEEE. 2011: 505–511

  Abstract

  This paper introduces a silicon-based imaging array for remote measurements of complex permittivity of tissue. Using a coherent pulsed measurement approach, this time-frequency resolved technique recovers the three dimensional mapping of electrical properties of the subject in the microwave/millimeter-wave frequency spectrum. Some of the major challenges in the design of the system are described. Initial measurement results from the prototype high-resolution transmitter fabricated in a 0.13 μm SiGe process are described. The transmitter achieves pulse widths suitable for millimeter-level accuracy imaging.

  View details for Web of Science ID 000298810000122

  View details for PubMedID 22254359

• A 90GHz Pulsed-Transmitter with Near-Field/Far-Field Energy Cancellation using a Dual-Loop Antenna Arbabian, A., Kang, S., Callender, S., Afshar, B., Chien, J., Niknejad, A. 2011
• A 90 GHz Hybrid Switching Pulsed-Transmitter for Medical Imaging IEEE JOURNAL OF SOLID-STATE CIRCUITS Arbabian, A., Callender, S., Kang, S., Afshar, B., Chien, J., Niknejad, A. M. 2010; 45 (12): 2667-2681

  View details for DOI 10.1109/JSSC.2010.2077150

  View details for Web of Science ID 000285052300016

• A 90GHz Carrier 30GHz Bandwidth Hybrid Switching Transmitter with Integrated Antenna ISSCC 2010 Digest of Teach. Arbabian, et. al., A. 2010: 420-421
• A 90nm CMOS Low-Power 60GHz Transceiver with Integrated Baseband Circuitry IEEE Journal of Solid State Circuits Marcu, C., Chowdhury, D., Thakkar, C., Park, J., Kong, L., Tabesh, M., Arbabian, A. 2009; 44 (12): 3434-3447
• A 90nm CMOS Low-Power 60GH Transceiver with Integrated Baseband Circuitry ISSCC 2010 Digest of Tech. Papers Marcu, C., Chowdhury, D., Thakkar, C., Kong, L., Tabesh, M., Park, J., Arbabian, A. 2009: 314-315
• Design of a CMOS Tapered Cascaded Multistage Distributed Amplifier IEEE Transactions on Microwave Theory and Techniques Arbabian, A., Niknejad, A., M. 2009; 57 (4): 938-947
• A Tapered Cascaded Multi-Stage Distributed Amplifier with 370GHz GBW in 90nm CMOS Arbabian, A., Niknejad, A., M. 2008
• A Broadband Distributed Amplifier with Internal Feedback Providing 660GHz GBW in 90nm CMOS ISSCC 2008 Digest of Tech. Papers Arbabian, A., Niknejad, A., M. 2008: 196-197
• A 60-GHz 90- nm CMOS Cascode Amplifier with Interstage Matching Heydari, B., Reynaert, P., Adabi, E., Bohsali, M., Afshar, B., Arbabian, A. 2007
• Internal Unilaterization Technique for CMOS mm-Wave Amplifiers Heydari, B., Adabi, E., Bohsali, M., Afshar, B., Arbabian, A., Niknejad, A., M. 2007
• The Optimizations of PRF Staggering in a MTI Radar Arbabian, A., Bastani, M., H., Tabesh, M. 2005
• Rural Telecommunications in Iran: A Hybrid Solution Tabesh, M., Arbabian, A., Javaheri, H., Jalali, A. 2005
• Wireless Data Links for Next-Generation Networked Micro-Implantables Proc. 2018 IEEE Custom Integrated Circuits Conference Wang, M. L., Baltsavias, S., Chang, T., Weber, M. J., Arbabian, A. 2018
• Scaling of Ultrasound-Powered Receivers for Sub-Millimeter Wireless Implants IEEE Biomedical Circuits and Systems Conference (BioCAS) Chang, T., Weber, M. J., Charthad, J., Baltsavias, S., Arbabian, A. 2017