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US08817520B2 Two capacitor self-referencing nonvolatile bitcell 有权
两个电容器自参考非易失性位单元

Two capacitor self-referencing nonvolatile bitcell
Abstract:
A system on chip (SoC) provides a memory array of self referencing nonvolatile bitcells. Each bit cell includes two ferroelectric capacitors connected in series between a first plate line and a second plate line, such that a node Q is formed between the two ferroelectric capacitors. The first plate line and the second plate line are configured to provide a voltage approximately equal to first voltage while the bit cell is not being accessed. A clamping circuit coupled to the node Q. A first read capacitor is coupled to the bit line via a transfer device controlled by a first control signal. A second read capacitor coupled to the bit line via another transfer device controlled by a second control signal. A sense amp is coupled between the first read capacitor and the second read capacitor.
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