I received the B.Tech, M.S and PhD degrees from IIT Madras, Oregon State University and the University of Washington, Seattle, respectively, all in Electrical Engineering. Between 1998 and 2004, I held product development and research positions at Analog Devices, Motorola and Intel, where I developed RF and mixed-signal IC's for applications in communication systems including multi-antenna transceivers, data converters, power amplifiers, frequency synthesizers etc.


Research Overview

My research broadly addresses design and technological challenges related to RF and mixed-signal integrated circuits and systems for emerging applications. The following paragraphs provide succinct descriptions and links that summarize my research interests. Please see the publications page for my journal and conference publications.

Circuit Design

I have worked extensively on Silicon-based Phased-Array Beamformer IC's. Energy-efficient beamforming IC's will play a central role in next-generation wireless communication systems.  I developed some of the earliest fully-integrated phased-array IC's, including this and this. I gave a talk at the ISSCC 2012 forum "Beamforming Techniques and RF Transceiver Design." My thoughts on future outlook were summarized in a panel discussion following the forum. More recently, my research has focused on developing new design techniques for energy-efficient, wideband beamformers at millimeter-wave frequencies. I presented my research group's latest work on this topic at the IMS 2015 workshop "Towards 5G: Circuits, Systems, MIMO and Beamforming".

I also work on Mixed-signal interface IC's including analog-to-digital converters and frequency synthesizers. You can read short summaries of current projects at the National Science Foundation website. Needless to say, we are very grateful to NSF for their funding support.

Circuits-Technology Co-Development

With the slowing down and anticipated end of CMOS technology scaling, the search for "more-than-Moore" and "beyond-CMOS" technologies has intensified. For several years, I have worked to develop Phase-Change Via Reconfigurable RF Transceivers, an example of the more-than-Moore approach.  Along with my collaborators, James Bain, Ed Schlesinger, Gary Fedder and Larry Pileggi, I pioneered the approach of using phase-change materials to reconfigure RC IC's. I gave this talk in 2008 that originally articulated this vision and its challenges. I also led an exploratory project that led to the first prototypes demonstrating this vision. This is the final report of that project. I also gave a talk on this work at an RFIC 2015 workshop "Power Amplifiers for Software Defined Radio."

As a result of this exploratory research, this technology has gained widespread interest in the academic and industrial research communities. Our research group at CMU continues to develop this technology to enable its adoption in reconfigurable radios of the future.

Contact Information

2120 Hamerschlag Hall
5000 Forbes Ave
Pittsburgh, PA 15213

Phone: (412)-268-1290

Administrative Assistant

Judy Bandola
2126 Hamerschlag Hall
Phone: (412)-268-2224
Fax: (412)-268-1374