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A 3.4 Mb SRAM macro is developed with a built-in stability sensor for adaptive wordline under-drive (AWLUD) in 32 nm HK-MG CMOS technology. By tracking temperature, voltage and process variation of each die, the AWLUD is shown to lower VCCmin by 130 mV, increase yield by 9% at a target frequency, and is projected to reduce test time up to 40% by eliminating die-by-die WLUD programming.
Pulsed wordline (PWL) & pulsed bitline (PBL) techniques to improve SRAM cell stabilities in single-Vcc microprocessor designs are evaluated in 65nm CMOS. At 0.7V Vcc, PWL improves cell failure rate by 15times while incurring <1% area overhead. Both PBL & PWL with read-modify-write (PWL-RMW) provide the best improvements (26times) in cell stability, with significant area overheads (4-8%)
A 70MB SRAM chip is designed and fabricated in 65nm CMOS technology. A column-based dynamic multi-V, scheme is integrated into the design to improve cell read and write margins while reducing power consumption. The design operates at 3GHz with a 1.1V power supply.
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