Silicon-based RF and mm-wave phased arrays

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					                  Electrical Engineering Department
                                 Harish Krishnaswamy
                   University of Southern California, Los Angeles
                        Electrical Engineering Department

                               Thursday, April 11, 2008
                           EE Conference Room, 1306 Mudd

  RF and mm-Wave Phased Arrays: Techniques for Silicon Integration
The integration of millimeter-wave systems in silicon-based technologies has generated
tremendous interest in academia and industry over the last five years. However, the efforts
thus far have focused on the direct application of conventional microwave design
techniques to silicon. Relying heavily on modular design, apriori measurement of the
individual active and passive devices, and simple circuit topologies, this approach misses
the fundamental point of silicon integration. Silicon-based technologies, particularly CMOS,
allow the designer to reliably integrate millions of transistors onto a single chip. This paves
the way for innovative compact and power-efficient architectures that exploit multi-
functional circuits, nonlinear phenomena and “free” calibration circuitry.

This talk will present architectures and implementations along these lines that attempt to
truly harness the power of silicon at RF and mm-wave frequencies. The emphasis will be
on an integrated phased-array-transceiver architecture that exploits a nonlinear injection-
pulling phenomenon and eliminates key building blocks, such as mixers, power splitters
and phase shifters. Theoretical formulations for performance metrics, such as sensitivity,
linearity and mismatch tolerance, will be presented. The talk will also include results from
fully-integrated 4-channel phased-array prototypes implemented in 0.13μm CMOS and
operating in the 22-29GHz frequency band. These prototypes exhibit state-of-the-art
performance at a fraction of the area and power consumptions of conventional designs.

Harish Krishnaswamy received the B.Tech. degree in Electrical Engineering from the
Indian Institute of Technology-Madras, India, in 2001, and the M.S. degree in Electrical
Engineering from the University of Southern California (USC) in 2003. He is currently a
doctoral candidate at USC.

His research interests include high-quality integrated passive elements, high-frequency
oscillators and integrated RF and mm-wave phased-array transceivers. In the summers of
2006 and 2007, he held internship positions at Sierra Monolithics, Inc. and the IBM T. J.
Watson Research Center respectively, and worked on mm-wave building blocks for
wireless transceivers.

He received the IEEE International Solid State Circuits Conference (ISSCC) Lewis Winner
Award for Outstanding Paper in 2007

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