Invention Grant
US5324961A Stacked capacitor SRAM cell 失效
堆叠电容SRAM单元

Stacked capacitor SRAM cell
Abstract:
This is an SRAM cell and the cell can comprise: two NMOS drive transistors; two PMOS load transistors; first and second bottom capacitor plates 50,52, with the first plate 50 being over a gate 34 of one of the drive transistors and the second plate 52 being over a gate 40 of another of the drive transistors; a layer of dielectric material 68 over the first and second bottom capacitor plates; and first and second top capacitor plates 20, 26 , over the dielectric layer, with the first top capacitor 20 plate forming a gate of one of the load transistors and with the second top capacitor plate 26 forming a gate of another of the load transistors whereby the capacitor plates form two cross-coupled capacitors between the gates of the drive transistors and the stability of the cell is enhanced. This is also a method of forming an SRAM cell.
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