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A Low Vth SRAM Reducing Mismatch of Cell-Stability with an Elevated Cell Biasing Scheme
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  • A Low Vth SRAM Reducing Mismatch of Cell-Stability with an Elevated Cell Biasing Scheme
  • A Low Vth SRAM Reducing Mismatch of Cell-Stability with an Elevated Cell Biasing Scheme
저자명
Yamauchi. Hiroyuki
간행물명
Journal of semiconductor technology and science
권/호정보
2010년|10권 2호|pp.118-129 (12 pages)
발행정보
대한전자공학회
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정기간행물|ENG|
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이 논문은 한국과학기술정보연구원과 논문 연계를 통해 무료로 제공되는 원문입니다.
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기타언어초록

A lower-threshold-voltage (LVth) SRAM cell with an elevated cell biasing scheme, which enables to reduce the random threshold-voltage (Vth) variation and to alleviate the stability-degradation caused by word-line (WL) and cell power line (VDDM) disturbed accesses in row and column directions, has been proposed. The random Vth variation (${sigma}Vth$) is suppressed by the proposed LVth cell. As a result, the LVth cell reduces the variation of static noise margin (SNM) for the data retention, which enables to maintain a higher SNM over a larger memory size, compared with a conventionally being used higher Vth (HVth) cell. An elevated cell biasing scheme cancels the substantial trade-off relationship between SNM and the write margin (WRTM) in an SRAM cell. Obtained simulation results with a 45-nm CMOS technology model demonstrate that the proposed techniques allow sufficient stability margins to be maintained up to $6{sigma}$ level with a 0.5-V data retention voltage and a 0.7-V logic bias voltage.