Rajeevan Amirtharajah

Rajeevan Amirtharajah

Associate Professor

(530) 754-6562


Ph. D. in Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, MA, 1999
M. Eng. in Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, MA, 1994
B.S. in Electrical Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA, 1994

Professional Experience

Associate Professor, University of California, Davis, CA, 2008-Present
Assistant Professor, University of California, Davis, CA, 2003-2008
Independent Consultant, SMaL Camera Technologies, Cambridge, MA, 2003
Senior Member of Technical Staff, Intel, Hudson, MA, 2000-2002
Senior Member of Technical Staff, High Speed Solutions Corp., Hudson, MA, 1999-2000


Electrical and Computer Engineering Graduate Group
Center for Information Technology Research in the Interest of Society (CITRIS)

Research Interests

Low power digital and mixed-signal integrated circuits, energy harvesting, circuits and architectures for emerging electrical andoptical devices.

Research Activities

Prof. Amirtharajah's research activities focus on the development and implementation of electronic systems which are powered by energy harvested from their environment. This includes the conversion of incident light (solar energy harvesting) and environmental mechanical vibrations into electrical form, power electronics to generate stable supply voltages, and load circuits which consume less than one milliwatt. These systems form the foundation for self-powered wireless sensor networks which have applications in green building design, infrastructure and environmental monitoring, medicine, and defense.

Recent projects include the development of disk-shaped piezoelectric transducers for vibration-to-electric energy conversion, highly efficient integrated rectifier designs for multiple electrode energy harvesters, self-timed circuits and embedded dynamic memory for time-varying power supplies, integrated solar cells, and energy scalable reconfigurable arays for sensor signal processing. We are initiating new projects exploring how novel devices such as silicon nanowires can be best exploited for low power digital and mixed-signal integrated circuits at the end of the CMOS roadmap. Possible applications of these emerging devices include sensing elements for biological and chemical agents, switches, current buffers, and interconnect for 3D integration.

Selected Publications

Guilar, N.J., Amirtharajah, R., and Hurst, P.J., "A Full-Wave Rectifier for Interfacing with Multi-Phase Piezoelectric Energy Harvesters," IEEE International Solid-State Circuits Conference Digest of Technical Papers (ISSCC 2008), pp.302-615, 3-7 Feb. 2008.

Wenck, J., Amirtharajah, R., Collier, J., and Siebert, J., "AC Power Supply Circuits for Energy Harvesting," 2007 IEEE Symposium on VLSI Circuits, pp.92-93, 14-16 June 2007.

Oliver, J.Y., Amirtharajah, R., Akella, V., Geyer, R., and Chong, F.T., "Life Cycle Aware Computing: Reusing Silicon Technology," Computer, vol.40, no.12, pp.56-61, Dec. 2007.

Amirtharajah, R., Collier, J., Siebert, J., Zhou, B., and Chandrakasan, A., "DSPs for energy harvesting sensors: applications and architectures," IEEE Pervasive Computing,, vol.4, no.3, pp. 72-79, July-Sept. 2005.

Amirtharajah, R. and Chandrakasan, A., "A micropower programmable DSP using approximate signal processing based on distributed arithmetic," , IEEE Journal of Solid-State Circuits, vol.39, no.2, pp. 337-347, Feb. 2004.