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Speaker: Dr. Timothy O. Dickson, Principal Research Scientist, IBM T.J. Watson Research Center
Topic: High-Speed DACs for 100+ Gb/s Wireline Links
Abstract:
Digital-to-analog converters (DACs) operating above 50GS/s are critical components of modern transmitters for wireline applications. These circuits permit data modulation and equalization to be moved from the analog domain (as was common in links operating below 50Gb/s) to the digital domain, thereby enabling today’s serial links operating at 100-200Gb/s. This lecture explores DAC design for wireline applications. Driver and multiplexer design techniques will be introduced, including those used for current- mode (CML) and voltage-mode (SST) drivers found in state-of-the-art serial links. As systems explore the use of more sophisticated modulation formats such as higher-order time domain pulse amplitude modulation (e.g., PAM6 or PAM8) or frequency domain modulation (e.g., OFDM), higher linearity DACs will be required than those employed in existing PAM4 systems. Techniques for adaptive calibration of DAC static linearity will be discussed. Designs of two different 8b DACs operating at 56 and 72GS/s in 7nm and 4nm FinFET technologies will be described as case studies.
Bio:
Timothy O. (Tod) Dickson (Senior Member, IEEE) received dual B.Sc. degrees in electrical and computer engineering with highest honors from the University of Florida in 1999. He completed the M. Eng degree at the University of Florida in 2002 and the Ph.D. degree at the University of Toronto in 2006, both in electrical engineering. His Ph.D. work was in the area of serial transceivers operating up to 80 Gb/s in SiGe BiCMOS technologies, focusing on the development of low-noise and low-power design methodologies. In 2006, he joined the IBM T.J. Watson Research Center in Yorktown Heights, N.Y where he is currently a Principal Research Scientist. His research focuses on the design of high-speed, low-power serial transceivers for electrical and optical links. Since 2014, he has served on the Technical Advisory Board of the Semiconductor Research Corporation Analog-Mixed Signal Circuits, Systems, and Devices (AMS-CSD) thrust. He is also an Adjunct Professor at Columbia University, where he has taught graduate level courses in analog and mixed- signal integrated circuit design since 2007. Dr. Dickson has been a recipient or co- recipient of several best paper awards, including the Best Paper Award for the 2009 IEEE Journal of Solid-State Circuits, the Beatrice Winner Award for Editorial Excellence at the 2009 ISSCC, the Best Paper Award at the 2015 IEEE Custom Integrated Circuits Conference (CICC), and the Best Student Paper Award at the 2004 Symposium on VLSI Circuits He was a member of the Technical Program Committee (TPC) of the IEEE Compound Semiconductor Integrated Circuit Symposium from 2007-2009, and of the IEEE CICC from 2017-2023 where he chaired the wireline subcommittee. He was a guest editor of the October 2010 issue of the IEEE Journal of Solid- State Circuits. From 2018-2023, he was an Associate Editor for the IEEE Solid-State Circuits Letters. Since 2024 he has been an Associate Editor for the IEEE Open Journal of the Solid-State Circuits Society.
Date & Time: October 25, 2024, 1:00pm-2:00pm
Cost: Free
Seminar Info
Location: (https://engineering.utdallas.edu/engineering/files/UTD-Campus-and-Parking-Map.pdf), (https://map.utdallas.edu/), (https://www.google.com/maps/place/Erik+Jonsson+School+of+Engineering+and+Computer+Science,+ECSS/@32.9853108,-96.751746,17z/data=!4m13!1m7!3m6!1s0x864c1c7277dd89ab:0x262b391b4b52ad15!2s800+W+Campbell+Rd,+Richardson,+TX+75080!3b1!8m2!3d32.9816479!4d-96.752658!3m4!1s0x864c21fff682dc29:0x5f0c06ff030083e1!8m2!3d32.9860626!4d-96.7507344)
Event Co-Sponsored by IEEE Solid-State Circuits Society and MTT-S Dallas
Room: ECSS 2.203, Erik Jonsson School of Engineering and Computer Science, 800 W Campbell Rd, Richardson, Texas, United States, 75080, Virtual: https://events.vtools.ieee.org/m/440787