Phase-Locked Freq. Synthesis & Modulation
Woogeun Rhee, Tsinghua University
Abstract: Frequency synthesis and modulation by the DS fractional-N PLL are essential in modern wireless transceivers. In addition to loop parameter variability, leakage current, and matching problems, the DS fractional-N PLL needs to deal with quantization noise and nonlinearity in consideration of phase noise, spur, and settling time. In this talk, various fractional-N PLL architectures (analog/digital/hybrid) will be reviewed, and recent circuit techniques for mitigating quantization noise and nonlinearity will be presented. Then, PLL-based modulation methods (1-point/2-point/2+-point) will be discussed. This tutorial also gives some insights into PLL system perspectives and practical design aspects tailored for circuit designers.
He 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 currently an IEEE Distinguished Lecturer of the Solid-State Circuits Society (2016-2017) and serves as an Associate Editor for IEEE JSSC. He has been an Associate Editor for IEEE TCAS-II (2008-2009) and a Guest Editor for IEEE JSSC 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.