Invention Grant
- Patent Title: Pseudo-8T NVSRAM cell with a charge-follower
- Patent Title (中): 带有充电跟随器的伪8T NVSRAM单元
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Application No.: US14064220Application Date: 2013-10-28
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Publication No.: US08971113B2Publication Date: 2015-03-03
- Inventor: Peter Wung Lee
- Applicant: Aplus Flash Technology, Inc
- Applicant Address: US CA Fremont
- Assignee: Aplus Flash Technology, Inc.
- Current Assignee: Aplus Flash Technology, Inc.
- Current Assignee Address: US CA Fremont
- Agency: Raywell Group, LLC
- Main IPC: G11C11/34
- IPC: G11C11/34 ; G11C14/00

Abstract:
The present invention discloses a 10T NVSRAM cell with a 6T SRAM cell with 4T Flash cell with one dedicated Flash-based Charger. In addition, a Pseudo-8T NVSRAM cell with a shared Flash-based Charger between two adjacent 8T NVSRAM cells at top and bottom in cell layout is also disclosed to further reduce cell size by 20%. As opposed to the prior art of 12T NVSRAM cell, the Store operation of the above two preferred embodiments use a DRAM-like charge-sensing scheme with Flash cell configured into a voltage follower ensured by the Flash-based Charger to obtain the final ΔVQ-QB>0.2V at Q and QB nodes of each SRAM cell to cover all the mismatched of parasitic capacitance in flash cell devices and layout for a reliable amplification by ramping up SRAM's VDD line and ramping down SRAM's VSS line.
Public/Granted literature
- US20140119119A1 PSEUDO-8T NVSRAM CELL WITH A CHARGE-FOLLOWER Public/Granted day:2014-05-01
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