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Negative Bias Temperature Instability (NBTI) is an important lifetime reliability problem in microprocessors. SRAM-based structures within the processor are especially susceptible to NBTI since one of the PMOS devices in the memory cell always has an input of '0'. Previously proposed recovery techniques for SRAM cells aim to balance the degradation of the two PMOS devices by attempting to keep their inputs at a logic '0' exactly 50% of the time. However, one of the devices is always in the negative bias condition at any given time.
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