Abstract:

As future wireless systems with advanced CMOS technology demand not only low-power but also low-voltage design, matching and linearity problems have become more critical than ever. The ΔΣ modulation technique enables robust mixed-signal design but still requires careful design over nonlinearity when a multi-bit ΔΣ quantizer is used. This talk discusses an extensive use of a 1-bit ΔΣ modulation method to build robust communication systems by mitigating the nonlinearity problem. In this talk, four examples of modulation and transceiver systems which utilize the 1-bit modulation/conversion schemes are introduced, including two-point modulation without DCO nonlinearity calibration, SSCG/FMCW modulation based on the BBPLL, and phase-domain receivers with 1-bit noise-shaping demodulation, and time-of-flight (TOF) ranging transceivers with the 1-bit ΔΣ PDC..

Biographies

• Woogeun Rhee

  received the B.S. degree in electronics engineering from Seoul National University, Seoul, Korea, in 1991, the M.S. degree in electrical engineering from the University of California, Los Angeles, in 1993, and the Ph.D. degree in electrical and computer engineering from the University of Illinois, Urbana-Champaign, in 2001.

  From 1997 to 2001, he was with Conexant Systems, Newport Beach, CA, where he was a Principal Engineer and developed low-power, low-cost fractional-N synthesizers. From 2001 to 2006, he was with IBM Thomas J. Watson Research Center, Yorktown Heights, NY and worked on clocking area for high-speed I/O serial links, including low-jitter phase-locked loops, clock-and-data recovery circuits, and on-chip testability circuits. In August 2006, he joined the faculty as an Associate Professor at the Institute of Microelectronics, Tsinghua University, Beijing, China, and became a Professor in December 2011. His current research interests include short-range low-power radios for next generation wireless systems and clock/frequency generation circuits for wireline and wireless communications. He holds 23 U.S. patents.

  Dr. Rhee is an IEEE Distinguished Lecturer of the Solid-State Circuits Society (2016-2017) and served as an Associate Editor for IEEE JOURNAL OF SOLID-STATE CIRCUITS (2012-2018). He has been an Associate Editor for IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS PART-II: EXPRESS BRIEFS (2008-2009) and a Guest Editor for IEEE JOURNAL OF SOLID-STATE CIRCUITS Special Issue in November 2012 and November 2013. He has served as a member of several IEEE conferences, including ISSCC (2012-2016), CICC, and A-SSCC.