Differential capacitance sense amplifier
Patent 6803794 Issued on October 12, 2004. Estimated Expiration Date: 
February 26, 2023. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
February 26, 2023. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesFerroelectric space charge capacitor memory Ferroelectric space charge capacitor memory Non-destructive read ferroelectric memory cell utilizing the ramer-drab effect Open loop variable gain amplifier using replica gain cell Patent #: 6621343 InventorsAssigneeApplicationNo. 10375563 filed on 02/26/2003US Classes:327/52, Differential amplifier327/54, Having feedback330/258, Having common mode rejection circuit330/254Having gain control meansExaminersPrimary: Wells, Kenneth B.Attorney, Agent or FirmInternational ClassG01R 1900AbstractA differential capacitance sense amplifier capable of measuring a small difference-signal capacitance in the presence of circuit mismatches and large unequal interconnect capacitances. The sense amplifier includes three sections: a common-mode section applies a ‘read’ voltage to two capacitors in a manner that rejects unequal interconnect capacitance, a difference-mode section generates a signal proportional to the capacitance difference between the two capacitors, and an offset-canceling section compensates for circuit mismatches in the difference-mode section. The amplifier can be adapted for use as a sense amplifier for a ferroelectric differential capacitance memory unit.Other References
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