We propose a new design scheme to improve the SRAM read and write operation margins in the presence of a large Vth variability. By applying this scheme to a 0.494 µm2 SRAM cell with a β ratio of 1, which is an aggressively small cell size, we can achieve a high-yield 8M-SRAM for a wide range of Vth value using a 65 nm LSTP CMOS technology.
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