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e-Seminar

Energy Efficient Circuit Architectures for Spectrum Sensing in Cognitive Radios

March 8, 2012
4:00 PM EST (1:00 PM PST)

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Abstract

One of the critical aspects for dynamic spectrum access in software defined radios (SDR) is to be able to sense the spectrum and distinguish between white and occupied spaces. Conventional SDRs strive to digitize the RF signal and perform spectrum sensing in the digital domain. However, for wideband inputs, this translates to infeasible ADC specifications. This talk will describe the design of CRAFT (Charge Re-use Analog Fourier Transform): an RF front-end channelizer for SDRs based on a 16 point analog domain FFT. The design relies on charge re-use to achieve 47 dB average SNDR on a 5 GS/s input, and consumes only 12.2 pJ/conv. By virtue of its large instantaneous input bandwidth, and ultra low power channelization capabilities, it aims to reduce both the sample rate and the dynamic range requirements for wideband digitization in SDRs.

Speaker

Ramesh Harjani
University of Minnesota

Ramesh Harjani is the E.F. Johnson Professor of Electronic Communications in the Department of Electrical & Computer Engineering at the University of Minnesota. He is a Fellow of the IEEE and a Distinguished Lecturer of the IEEE Circuits and Systems Society. He received his Ph.D. in Electrical Engineering from Carnegie Mellon University in 1989. He was at Mentor Graphics, San Jose before joining the University of Minnesota. He has been a visiting professor at Lucent Bell Labs, Allentown, PA and the Army Research Labs, Adelphi, MD. He co-founded Bermai, Inc, a startup company developing CMOS chips for wireless multi-media applications in 2001. Dr. Harjani received best paper awards at the 1987 DAC, 1988 ICCAD, the 1998 GOMAC and the 2007 & 2010 TECHCON. His papers have been recognized as one of the most influential in the first 25 years of DAC and the Best of ICCAD. His research group won 1st prize for the SRC Design Challenges in 2000 and 2003. He was an Associate Editor for IEEE Transactions on Circuits and Systems II in 1995, Guest Editors for the International Journal of High-Speed Electronics and Systems and for Analog Integrated Circuits and Signal Processing in 2004, and a Guest Editor for the Journal of Solid-State Circuits during 2009-2011. He was the Chair of the IEEE Circuits and Systems Society technical committee on Analog Signal Processing from 1999 to 2000. His research interests include analog/RF circuits for wired and wireless communication systems.