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Infrequent dynamic events like VCC droops and temperature changes result in the use of a static VCC guardband in 8T SRAM arrays. This paper proposes the use of tunable replica bits (TRBs) as a potential solution to mitigating a part of the VCC guardband. Measured data on a 16 KB 8T array featuring tun able replica bits illustrate 9% reduction of the operating minimum VCC (VMIN) and correspondingly a 7.5% reduction in array power.
Date of Publication: April 2011