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Abstract: Analog-to-digital converters that incorporate inherent anti-alias filtering and are easy to drive significantly simplify system design. The continuous-time pipelined (CTP) ADC is one such architecture — and it turns out to be a fundamental improvement over the conventional active filter followed by ADC cascade, both in power efficiency and linearity. This tutorial traces the evolution of the CTP ADC from first principles, starting with the limitations of a standalone filter+ADC chain and building up the CTP concept stage by stage. The extension of CTP principles to bandpass signal processing — where the power-noise product improves with increasing filter Q, precisely the opposite of what a standalone bandpass filter exhibits — is also discussed. Silicon results from prototype chips in 65 nm CMOS validate the concepts throughout.
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Bio: Shanthi Pavan is the NT Alexander Institute-Chair Professor of Electrical Engineering at the Indian Institute of Technology Madras, Chennai, India. He received the Sc.D. degree from Columbia University, New York, in 1999. From 1997 to 2000, he was with Texas Instruments in Warren, New Jersey, working on high-speed analog filters and data converters, and from 2000 to 2002 at Bigbear Networks in Sunnyvale, California, on microwave ICs for data communication. He returned to IIT Madras in July 2002, where he researches high-speed analog circuit design and signal processing, with a particular focus on continuous-time data converters. He is the co-author of Understanding Delta-Sigma Data Converters (second edition, Wiley-IEEE Press, 2017), which received the Wiley-IEEE Press Professional Book Award for 2020.
He is the recipient of several awards, including the IEEE Circuits and Systems Society Darlington Best Paper Award (2009), the Shanti Swarup Bhatnagar Award (2012), the Swarnajayanthi Fellowship (2009), and the ANRF J.C. Bose National Fellowship. He has served as the Vice President of Publications for the IEEE Solid-State Circuits Society. He is currently a Distinguished Lecturer of the IEEE Circuits and Systems Society and serves on the Technical Program Committee of ISSCC. He is a Fellow of IEEE, the Indian National Academy of Engineering, and the Indian National Academy of Science.