dr. Chao Chen
Electronic Instrumentation (EI), Department of Microelectronics
PhD thesis (Apr 2018): Front-End ASICs for 3-D Ultrasound: From Beamforming to Digitization
Promotor: Michiel Pertijs, Nico de Jong
Expertise: ASICs for medical ultrasound and data convertersThemes: Smart Ultrasound
Chao Chen received the B.Sc. degree in micro-electronics from Tsinghua University, Beijing, China in 2010, and the M.Sc. (cum laude) and Ph.D. degree in micro-electronics from the Delft University of Technology, Delft, The Netherlands, in 2012 and 2018, respectively. His Ph.D. research topic was front-end application-specified integrated circuit (ASIC) design for 3-D medical ultrasound imaging.
Since 2017, Dr. Chen has been a Senior Analog IC designer with Butterfly Network Inc., Guilford, CT, USA, where he contributed to the development of next-generation ASICs for portable ultrasound. In 2021, he moved back to the Netherlands as a postdoctoral researcher at TU Delft, while continuing to hold a position as Consultant at Butterfly Network. His research interests include integrated circuits for medical imaging, low-power sensor interfaces, and high-resolution data converters.
Dr. Chen has authored and co-authored more than 30 publications and holds 3 US patents. He was a recipient of the Huygens Scholarship in 2011, the ISSCC STGA Award in 2013, the IEEE IUS Best Student Paper Award in 2017, and the Else Kooi Award in 2019. He was also a co-recipient of the A-SSCC 2017 Best Student Paper Award.
Miniature ultrasound probes for real-time 3D imaging and monitoring of cardiac interventions
This research project will enable the next generation of miniature ultrasound probes for real-time 3D transesophageal echocardiography, suitable for use in small children and newborns.
- A Pitch-Matched Transceiver ASIC with Shared Hybrid Beamforming ADC for High-Frame-Rate 3D Intracardiac Echocardiography
Yannick M. Hopf; Boudewine W. Ossenkoppele; Mehdi Soozande; Emile Noothout; Zu-Yao Chang; Chao Chen; Hendrik J. Vos; Johan G. Bosch; Martin D. Verweij; Nico de Jong; Michiel A. P. Pertijs;
IEEE Journal of Solid-State Circuits,
Volume 57, Issue 11, pp. 3228--3242, November 2022. DOI: 10.1109/jssc.2022.3201758
Abstract: ...In this article, an application-specific integrated circuit (ASIC) for 3-D, high-frame-rate ultrasound imaging probes is presented. The design is the first to combine element-level, high-voltage (HV) transmitters and analog front-ends, subarray beamforming, and in-probe digitization in a scalable fashion for catheter-based probes. The integration challenge is met by a hybrid analog-to-digital converter (ADC), combining an efficient charge-sharing successive approximation register (SAR) first stage and a compact single-slope (SS) second stage. Application in large ultrasound imaging arrays is facilitated by directly interfacing the ADC with a charge-domain subarray beamformer, locally calibrating interstage gain errors and generating the SAR reference using a power-efficient local reference generator. Additional hardware-sharing between neighboring channels ultimately leads to the lowest reported area and power consumption across miniature ultrasound probe ADCs. A pitch-matched design is further enabled by an efficient split between the core circuitry and a periphery block, the latter including a datalink performing clock data recovery (CDR) and time-division multiplexing (TDM), which leads to a 12-fold total channel count reduction. A prototype of 8×9 elements was fabricated in a TSMC 0.18- μm HV BCD technology and a 2-D PZT transducer matrix with a pitch of 160μm , and a center frequency of 6 MHz was manufactured on the chip. The imaging device operates at up to 1000 volumes/s, generates 65-V transmit pulses, and has a receive power consumption of only 1.23 mW/element. The functionality has been demonstrated electrically as well as in acoustic and imaging experiments.
- Transceiver ASIC Design for High-Frame-Rate 3D Intracardiac Echocardiography
Yannick M. Hopf; Boudewine Ossenkoppele; Mehdi Soozande; Emile Noothout; Zu-Yao Chang; Chao Chen; Hendrik J. Vos; Johan G. Bosch; Martin D. Verweij; Nico de Jong; Michiel A. P. Pertijs;
In Proc. IEEE International Ultrasonics Symposium (IUS),
- Front-End ASICs for 3-D Ultrasound: From Beamforming to Digitization
PhD thesis, Delft University of Technology, April 2018.
- Energy-Efficient Self-Timed Zero-Crossing-Based Incremental Delta-Sigma ADC
MSc thesis, Delft University of Technology, November 2012.
Last updated: 7 Jul 2023