Comet Calendar Event Details

Enabling Robust and Efficient Ultra-Low Power Digital Systems through Runtime Energy Minimization under Performance Guarantees: The Case Study of a 65nm Sub-threshold Cortex-M0 Processor by Professor Visvesh Sathe (University of Washington)
Friday, Jul. 19
1 p.m. - 2 p.m. Location: ECSS 3.503


Ultra low-power systems, enabled by sub- and near-threshold computing hold much promise in a variety of sensing, IoT and bio-electronic applications. However, the Process, Voltage and Temperature (PVT) sensitivity of low-voltage CMOS circuits poses some formidable challenges, including (1) the need for a sizable portion of supply-voltage attributable to wasteful guard-bands for robust operation; and (2) a constantly varying energy-optimal operating supply voltage that depends on PVT and loading.

Real world applications demand energy-efficiency, but subject to meeting application performance requirements. In this talk, I will present an architecture that employs runtime computing to address this constrained optimization problem. This digital architecture minimizes total system dissipation (inclusive of regulator losses) subject to performance requirements, and operates in the context of a Unified Clock and Power (UniCaP) architecture to address wasteful guard-bands. Test chip measurements of a CMOS test-chip implementation of this architecture will be discussed, demonstrating robust minimum-energy tracking and a 90% reduction in supply-voltage margin.


Visvesh Sathe is an assistant professor at the University of Washington, where his group works on a number of topics related to digital, mixed-signal and power circuits and architectures. Prior to joining the University of Washington, he served as a Member of Technical Staff in the Low-Power Advanced Development Group at AMD, where he devised and evaluated new technologies in clocking, voltage-noise mitigation and circuit-design for energy-efficient and high-performance computing for adoption into production silicon. Dr. Sathe led the research and development effort at AMD that resulted in the first resonant clocked commercial microprocessor. Dr. Sathe received the B.Tech degree from the Indian Institute of Technology Bombay in 2001, and the M.S and Ph.D. degrees from the University of Michigan, Ann Arbor in 2004 and 2007, respectively.

Contact Info:
Donna Kuchinski, 972-883-5556
Questions? Email me.

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