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Design and optimization of multithreshold CMOS (MTCMOS) circuits

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3 Author(s)
Anis, M. ; Dept. of Electr. & Comput. Eng., Univ. of Waterloo, Ontario, Ont., Canada ; Areibi, S. ; Elmasry, M.

Reducing power dissipation is one of the most important issues in very large scale integration design today. Scaling causes subthreshold leakage currents to become a large component of total power dissipation. Multithreshold technology has emerged as a promising technique to reduce leakage power. This paper presents several heuristic techniques for efficient gate clustering in multithreshold CMOS circuits by modeling the problem via bin-packing (BP) and set-partitioning (SP) techniques. The SP technique takes the circuit's routing complexity into consideration which is critical for deep submicron (DSM) implementations. By applying the techniques to six benchmarks to verify functionality, results obtained indicate that our proposed techniques can achieve on average 84% savings for leakage power and 12% savings for dynamic power. Furthermore, four hybrid clustering techniques that combine the BP and SP techniques to produce a more efficient solution are also devised. Ground bounce was also taken as a design parameter in the optimization problem. While accounting for noise, the proposed hybrid solution achieves on average 9% savings for dynamic power and 72% savings for leakage power dissipation at sufficient speeds and adequate noise margins.

Published in:

Computer-Aided Design of Integrated Circuits and Systems, IEEE Transactions on  (Volume:22 ,  Issue: 10 )

Date of Publication:

Oct. 2003

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