Invention Grant
- Patent Title: SRAM cell design to improve stability
- Patent Title (中): SRAM单元设计提高稳定性
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Application No.: US11952587Application Date: 2007-12-07
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Publication No.: US07768816B2Publication Date: 2010-08-03
- Inventor: Rajiv V. Joshi , Yue Tan , Robert C. Wong
- Applicant: Rajiv V. Joshi , Yue Tan , Robert C. Wong
- Applicant Address: US NY Armonk
- Assignee: International Business Machines Corporation
- Current Assignee: International Business Machines Corporation
- Current Assignee Address: US NY Armonk
- Agency: Scully, Scott, Murphy & Presser, P.C.
- Agent Joseph P. Abate, Esq.
- Main IPC: G11C11/00
- IPC: G11C11/00

Abstract:
A design structure embodied in a machine readable medium for use in a design process, the design structure representing a novel semiconductor SRAM cell structure that includes at least two pull-up transistors, two pull-down transistors, and two pass-gate transistors. In one embodiment, the SRAM cell is an 8T SRAM cell structure implements a series gating feature for implementing Column Select (CS) and Row Select (WL) cell storage access with enhanced stability. Particularly, the 8-T approach adds two pass-gates, two series connected transistor devices connected at complementary nodes of two cross-coupled inverters, to control column select and row (word) select. In the other embodiment, the SRAM cell is a 9T SRAM cell structure includes a transmission gate to implement Column Select (CS) and Row Select (WL) cell storage access with enhanced stability. The 9-T approach adds three transistors to perform ANDING function to separate the row select and column select signal functions.
Public/Granted literature
- US20090147560A1 NOVEL SRAM CELL DESIGN TO IMPROVE STABILITY Public/Granted day:2009-06-11
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