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Variable Input Delay CMOS Logic for Low Power Design
 Auburn University
, 2005
"... Modern digital circuits consist of logic gates implemented in the complementary metal oxide semiconductor (CMOS) technology. The time taken for a logic gate output to change after one or more inputs have changed is called the delay of the gate. A conventional CMOS gate is designed to have the same i ..."
Abstract

Cited by 4 (0 self)
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Modern digital circuits consist of logic gates implemented in the complementary metal oxide semiconductor (CMOS) technology. The time taken for a logic gate output to change after one or more inputs have changed is called the delay of the gate. A conventional CMOS gate is designed to have the same input to output delay irrespective of which input caused the output to change. We propose a new gate design that has different delays along various input to output paths within the gate. This is accomplished by inserting selectively sized “permanently on ” series transistors at the inputs of the logic gate. We demonstrate the use of the variable input delay CMOS gates for a totally glitchfree minimum dynamic power implementation of a digital circuit. Applying a previously described linear programming method to the c7552 benchmark circuit, we obtained a power saving of 58 % over an unoptimized design. This power consumption was 18% lower than that for an alternative low power design using conventional CMOS gates. All circuits had the same overall delay. Since the overall delay was not allowed to increase, the glitch elimination with conventional gates required insertion of delay buffers on noncritical paths. The use of the variable input delay gates drastically reduced the required number of delay buffers. 1
Total Power Minimization in GlitchFree CMOS Circuits Considering Process Variation
"... Compared to subthreshold leakage, dynamic power is normally much less sensitive to the process variation due to its approximately linear relation to the process parameters. However, the average dynamic power of a circuit optimized by deterministic glitch elimination (using hazard filtering and path ..."
Abstract
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Compared to subthreshold leakage, dynamic power is normally much less sensitive to the process variation due to its approximately linear relation to the process parameters. However, the average dynamic power of a circuit optimized by deterministic glitch elimination (using hazard filtering and path balancing) increases because glitches randomly start reappearing under the influence of process variation. Combining existing techniques, we propose a new statistical mixed integer linear programming (MILP) formulation, which combines glitch elimination and dualthreshold design to statistically minimize the total power in a glitchfree circuit under process variation. 1.
Total Power Minimization in GlitchFree CMOS Circuits Considering Process Variation
, 2008
"... Compared to subthreshold leakage, dynamic power is normally much less sensitive to the process variation due to its approximately linear relation to the process parameters. However, the average dynamic power of a circuit optimized by a deterministic path balancing approach increases because the filt ..."
Abstract
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Compared to subthreshold leakage, dynamic power is normally much less sensitive to the process variation due to its approximately linear relation to the process parameters. However, the average dynamic power of a circuit optimized by a deterministic path balancing approach increases because the filtered glitches randomly start reappearing under the influence of process variation. Combining several existing techniques, we propose a new statistical mixed integer linear programming (MILP) formulation, which uses path balancing and dualthreshold techniques to statistically minimize the total power in glitchfree circuits considering process variation.