Design of a Continuous-Time Delta-Sigma Modulator for Bio-signal Acquisition

Ye-Dam Kim; Seung-Tak Ryu

Ye-Dam Kim Korea Advanced Institute of Science and Technology
Seung-Tak Ryu Korea Advanced Institute of Science and Technology

Keywords: Analog-to-Digital Converter (ADC), Continuous-Time (CT), Delta-Sigma Modulator (DSM)

Abstract

This work presents a design methodology of a low-noise and low-power continuous-time delta-sigma modulator (CT DSM) architecture for bio-signal acquisition. Along with the 2^nd-order CT loop filter architecture, a Successive Approximation Register (SAR) Analog-to-Digital Converter (ADC) is used as a quantizer to achieve power efficiency. The incremental operation is added to enable multi-channel processing. Designed and fabricated in a 180nm CMOS process, the proposed architecture achieves 80.1dB SNDR in a 250kHz bandwidth (BW) under a 1.8V supply. With a power consumption of 2mW, the proposed architecture has a Schreier Figure of Merit (FoM_S) of 161dB.

Author Biographies

Ye-Dam Kim, Korea Advanced Institute of Science and Technology

Ye-Dam Kim received the B.Eng. degree in electronic engineering from The Chinese University of Hong Kong, Hong Kong SAR, China, in 2016, and the M.S. degree in electrical engineering from the Korea Advanced Institute of Science and Technology (KAIST), Daejeon, South Korea, in 2019, where she is currently pursuing the Ph.D. degree.
Her current research interests include analog and mixed-signal IC design, especially on low-noise low-power data converters.

Seung-Tak Ryu, Korea Advanced Institute of Science and Technology

Seung-Tak Ryu received the M.S. and Ph.D. degrees from the Korea Advanced Institute of Science and Technology (KAIST), Daejeon, South Korea, in 1999 and 2004, respectively. From 2001 to 2002, he was with the University of California at San Diego, La Jolla, CA, USA, as a Visiting Researcher, sponsored through the Brain Korea 21 (BK21) Program. In 2004, he joined Samsung Electronics, Yongin, South Korea, where he was involved in mixed-signal IP development. From 2007 to 2009, he was with the Information and Communications University (ICU), Daejeon, as an Assistant Professor. He has been with the School of Electrical Engineering, KAIST, since 2009, where he is currently a Professor.
His research interests include analog and mixed-signal integrated circuit (IC) design with an emphasis on data converters and sensors.

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