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This paper explores the design and optimization of quasi-floating gate MOS techniques to low-voltage/low-power digital circuitry. The simulated power consumption of standard CMOS gates is compared to that of QFGMOS implementations in a 0.18μm process for different supply voltages and device sizes. A 0.4V VDD full-adder biased for propagation delay similar to that of 0.8V CMOS is simulated and shown to consume 1.2μW for a 50MHz input, representing more than a 50% power reduction over the CMOS equivalent. A divide-by-16 circuit designed for operation at a maximum frequency of 400MHz uses 25μW, 45μW, and 75μW for supplies of 0.4V, 0.6V and 0.8V.
Date of Conference: 20-24 July 2005