Chen, Zhongjian
Professor
Research Interests: Interface circuit design.
Office Phone: 86-10-6276 5927
Email: chenzj@pku.edu.cn
Chen, Zhongjian is a professor in the Department of Microelectronics, School of EECS. He obtained his B.Sc. and Ph.D. from Peking University in 1997 and 2002 respectively. His research interests include sensor interface circuit design and low power circuit design..
Dr. Chen has published more than 100 journal/conference papers (including TCAS-I, ISCAS, EL and JCSC) and holds more than 20 patents. He has served in the Technical Program Committee of ASICON 2003 and is serving as a Trustee Board Member in infrared specialized committees of Beijing Optical Society. He is in the Editorial Board of Laser & Infrared Journal and was awarded Zhengda Awards for Teachers and Scholarships (2016) and first prize of scientific and technological progress (2017, Ministry of Education).
Dr. Chen has more than ten research projects including NSFC, 863 project, etc. His research achievements are summarized as follows:
1) Design of high-resolution digital-readout interface ASIC for high-G capacitive micro-accelerometers: The major research topics in this field are low-noise, low-power, high-g, high-linearity and high-resolution digital readout techniques. He proposed some new module circuits and new system architectures to improve the performance of interface ASIC and micro-accelerometers system. A high-resolution analog-to-digital converter, electro-mechanical sigma-delta digital-feedback closed-loop system, high-resolution digital-readout temperature sensor and digital compensation algorithm for temperature drift are researched and designed for the requirement of digital compensation and low power of the micro-accelerometers. Open loop and closed loop readout ASICs were designed and verified these techniques.
2) Design of readout circuit for infrared focal plane array: Readout circuit has great influence on the performance of infrared imager such as NETD. The major research topics in this field are low-noise, low-power, TEC-less, non-uniformity correction and high-speed high-resolution digital readout techniques. He proposed some new readout structures such as: low temporal and spatial noise TEC-less frontend mirror readout structure; low-noise, low-power DAC based multi-dimensional non-uniformity correction algorithm; differential-ramp single-slope two-step ADC with on-chip digital CDS and DLL-based coarse-fine interpolated TDC; substrate temperature insensitive CTIA+ADC structure with high linearity and DLL-based gray-coded 14-bit low-power TDC scheme. 1024×1024, 640×512, 384×288 and 160×120 readout circuits were designed and verified these techniques.
3) Design of readout ASIC for radiation detectors: The front-end readout ASIC is the key device in radiation detection system because it is next to the detector, and has great influence on the system performance, such as noise, power consumption and linearity. The major research topics in this field are low-noise, low-power, high-speed and high-resolution digital readout techniques. He proposed some new circuits to meet these requirements such as: pole-zero cancellation resistant to increase the counting rate; negative feedback scheme to inhibit the baseline drift, etc. Front-end ASICs for personal dosimeter and high-energy particle detectors are designed and verified these techniques .
