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Talks & Seminars
Title: Approximate Logic Circuits: Theory and Application
Mr. Mihir Choudhury, Rice University
Date & Time: January 20, 2010 15:00
Venue: Conference Room, 01st floor, 'C' Block, Kanwal Rekhi (KReSIT) building
Abstract:
Over the years, CMOS technology scaling has resulted in faster transistors and higher device integration, that have been driving performance gains in integrated circuits. However, technology scaling has also led to a steady increase in power dissipation of a chip. Although circuit reliability issues, such as timing errors caused due to increase in delay around hot spots, were known to affect CMOS designs, achieving better trade-offs between performance and power dissipation was the primary objective in circuit design. However, in sub-100nm CMOS technologies, circuit reliability is emerging as a serious concern as process and dynamic variations affecting CMOS designs steadily increase. If not addressed during design, the impact of process and dynamic variations on circuit reliability may severely reduce the benefits of technology scaling. Hence, exploring new circuit design techniques to improve the trade-off between reliability, performance, and power in the presence of variations is a significant challenge for CMOS-based designs in the future. In this talk, I will describe a new paradigm for logic design based on approximate logic circuits to address reliability and performance challenges. Given a specification, an approximate logic circuit is functionally equivalent to the given specification for a significant portion of the input space, but has a smaller area, power, and delay footprint as compared to a circuit implementation of the original specification. Thus, the structural description of an approximate logic circuit may be different from a circuit implementation of the original specification, but the functional description of these circuits are closely related. I will present applications of approximate logic circuits to enhance reliability in the presence of defects, transient failures, and dynamic variability and to improve performance during logic synthesis.
Speaker Profile:
Mihir Choudhury received the B.Tech. degree in computer science and engineering from the Indian Institute of Technology, Bombay, India, in 2005, and the M.S. degree in electrical and computer engineering from Rice University in 2008. He is currently a Ph.D. candidate in computer engineering at Rice University, Houston, TX. His research interests include logic synthesis and design for reliability in scaled electronic technologies.
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