Gastvortrag im Rahmen des Graduiertenkollegs

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Prof. Dr.Yusuf LEBLEBICI, École Polytechnique Fédérale de Lausanne

Subthreshold Source-Coupled Circuit Design for Ultra-Low-Power Applications

Abstract: In this talk, a novel approach is presented for implementing ultra-low-power digital and mixed-signal components and systems using source-coupled logic (SCL) circuit topology, operating in weak inversion (subthreshold) regime. Minimum size pMOS transistors with shorted drain-substrate contacts are used as gate-controlled, very high resistivity load devices. Based on the proposed approach, the power consumption and the operation frequency of logic circuits can be scaled down linearly by changing the tail bias current of SCL gates over a very wide range spanning several orders of magnitude, which is not achievable in subthreshold CMOS circuits. Measurements in conventional 0.18um and 90nm technologies show that the tail bias current of each gate can be set as low as 10 pA, with a supply voltage of 300 mV, resulting in a power-delay product of less than 1 fJ per gate. Complex digital blocks such as parallel / pipelined adders and multipliers designed by using the STSCL topology will be presented - as well as some examples of mixed-signal blocks, e.g. ultra-low power A/D converters. Speaker Biography: Yusuf Leblebici received his Ph.D. degree in electrical and computer engineering from the University of Illinois at Urbana-Champaign (UIUC) in 1990. Between 1991 and 2001, he worked as a faculty member at UIUC, at Istanbul Technical University, and at Worcester Polytechnic Institute (WPI) - where he established and directed the VLSI Design Laboratory.

Since 2002, Dr. Leblebici has been a Chair Professor at the Swiss Federal Institute of Technology in Lausanne (EPFL), and director of Microelectronic Systems Laboratory. He is a coauthor of 4 textbooks, namely, "Hot-Carrier Reliability of MOS VLSI Circuits" (Kluwer Academic Publishers, 1993), "CMOS Digital Integrated Circuits: Analysis and Design" (McGraw Hill, 1st Edition 1996, 2nd Edition 1998, 3rd Edition 2002), CMOS Multichannel Single-Chip Receivers for Multi-Gigabit Optical Data Communications" (Springer, 2007) and "Fundamentals of High-Frequency CMOS Analog Integrated Circuits" (Cambridge University Press, 2009), as well as more than 200 articles published in various journals and conferences.

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