Independently-controlled-gate FinFET Schmitt trigger sub-threshold SRAMs

Chien Yu Hsieh*, Ming Long Fan, Pi-Ho Hu, Pin Su, Ching-Te Chuang

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


We propose three novel Independently-controlled-Gate Schmitt Trigger (IG-ST) FinFET SRAM cells for sub-threshold operation. The proposed IG ST 8T SRAM cells utilize split-gate FinFET devices to provide built-in feedback mechanism for Schmitt Trigger action. 3D mixed-mode simulations [1] are used to evaluate the RSNM, WSNM, HSNM, and Standby leakage of proposed cells. The proposed cells demonstrate 1.81X and 2.11X higher nominal RSNM at V CS=0.4V and 0.15V, respectively. The cell AC performance are evaluated, and shown to be adequate for the intended sub-threshold applications. Compared with previously reported 10T Schmitt Trigger sub-threshold SRAM cells, the proposed cells exhibit comparable or better RSNM, higher density, and lower Standby leakage current. 3D mixed-mode Monte Carlo simulations are performed to investigate the impacts of process variations (Leff and W fin) and random variations (Gate LER and Fin LER) on RSNM. Our results indicate that even at the worst corner, two of the proposed cells can provide sufficient margin of μ/σ ratio=7. With enhanced cell stability, reduced cell area and Standby leakage, adequate performance, and robust tolerance to process variations and random variations, these proposed cells are promising candidates for future ultra-low-voltage sub-threshold applications.

Original languageEnglish
Title of host publication2010 IEEE International SOI Conference, SOI 2010
StatePublished - 30 Dec 2010
Event2010 IEEE International Silicon on Insulator Conference, SOI 2010 - San Diego, CA, United States
Duration: 11 Oct 201014 Oct 2010

Publication series

NameProceedings - IEEE International SOI Conference
ISSN (Print)1078-621X


Conference2010 IEEE International Silicon on Insulator Conference, SOI 2010
CountryUnited States
CitySan Diego, CA

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