Power and Area Minimization by Reorganizing CMOS Complex-Gates

Masayoshi TACHIBANA  Sachiko KUROSAWA  Reiko NOJIMA  Naohito KOJIMA  Masaaki YAMADA  Takashi MITSUHASHI  Nobuyuki GOTO  

IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E79-A   No.3   pp.312-320
Publication Date: 1996/03/25
Online ISSN: 
Print ISSN: 0916-8508
Type of Manuscript: Special Section PAPER (Special Section of Selected Papers from the 8th Karuizawa Workshop on Circuits and Systems)
VLSI CAD,  logic synthesis,  complex-gate,  transistor sizing,  

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This paper proposes a method for achieving low-power control-logic modules using a combination of CMOS complex gate reorganization, transistor size optimization, and transistor layout. Complex gate reorganization minimizes transistor count and net count without changing the functionality of the circuit. Transistor sizing and layout are interdependent, the optimization of one results in the optimization of the other. The authors applied the reorganization method to a 10,846-transistor circuit, and succeeded in reducing the transistor count by 10%, and the net count by 9%. Transistor sizing and layout compaction reduced the average transistor size by one tenth, while the same delay was maintained. Total circuit capacitance, which is strongly related to power dissipation, was cut to 36%, even when wiring capacitances were dominant.