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. My research group has developed compact, energy-efficient millimeter-wave beamformers (such as this) that can operate over extremely large frequency spans. Our current focus is on the design of millimeter-wave hybrid beamforming transceivers, which support advanced features such as spatial multiplexing or multi-user MIMO and adaptive beam/null-steering. Some examples include this and this.

I also work on Mixed-signal interface IC's including analog-to-digital converters and frequency synthesizers. Our latest work is on the design of high-performance mm-wave digital  frequency synthesizers and their constituent blocks. A prototype described here demonstrated record phase-noise and spur performance.

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. This paper represents our latest results on this topic.

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