Patent ID: 7512908
Filing Date: 2009-03-31
Classification: G11C

Abstract:
1. A method for improving stability of static random access memory (SRAM) cells, comprising: providing multiple SRAM cells that each comprises at least two pull-up transistors, two pull-down transistors, and two pass-gate transistors, wherein each of said transistors comprises a source, a drain, and a gate electrode, wherein a ground line is connected to the sources of the two pull-down transistors of each SRAM cell for applying a ground voltage thereto, a power supply line is connected to the sources of the two pull-up transistors of each SRAM cell for applying a power supply voltage thereto, and a word line is connected to the gate electrodes of the two pass-gate transistors of each SRAM cell; and selecting one out of said multiple SRAM cells by applying a boosted word line voltage that ranges from about 1.1 V to about 1.6 V and is predetermined by using the BERKELEY-SPICE simulation program to the gate electrodes of the two pass-gate transistors of the selected SRAM cell through the word line of the selected SRAM cell, wherein the boosted word line voltage is generated by a boosted voltage generator comprising multiple transistors and multiple capacitors and is sufficiently higher than the power supply voltage so as to achieve a predetermined stability of less than about 1×10