- Patent Title: Static random access memory (SRAM) bit cell circuits with a minimum distance between a storage circuit active region and a read port circuit active region to reduce area and SRAM bit cell array circuits
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Application No.: US17038037Application Date: 2020-09-30
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Publication No.: US11289495B1Publication Date: 2022-03-29
- Inventor: Rahul Biradar , Sunil Sharma , Channappa Desai , Sonia Ghosh
- Applicant: QUALCOMM Incorporated
- Applicant Address: US CA San Diego
- Assignee: QUALCOMM Incorporated
- Current Assignee: QUALCOMM Incorporated
- Current Assignee Address: US CA San Diego
- Agency: Qualcomm Incorporated
- Main IPC: H01L27/11
- IPC: H01L27/11 ; G11C11/419 ; H01L23/522 ; H01L21/8238 ; H01L27/092

Abstract:
SRAM cell circuits have a minimum distance between a storage circuit active region and a read port circuit active region to reduce area. SRAM cell circuits are formed in FinFETs in a storage circuit active area and a read port active area each including one or more diffusion regions of a substrate. Design rule constraints limit a minimum center-to-center distance between adjacent parallel fins. The SRAM bit cell has a reduced total area because a distance between the storage circuit active area and the read port active area is reduced to a minimum separation distance of between 1.0 and 2.15 times the smallest center-to-center distance between adjacent fins. Minimizing a separation distance may include relocating a gate contact of a write access transistor from a location between the storage circuit active region and the read port active region to a location overlapping the storage circuit active area.
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