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Variable capacitance switched capacitor input system and method

  • US 6,970,126 B1
  • Filed: 06/25/2004
  • Issued: 11/29/2005
  • Est. Priority Date: 06/25/2004
  • Status: Active Grant
First Claim
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1. A variable capacitance switched capacitor input system comprising:

  • a differential integrator circuit having first and second input summing nodes;

    a variable sensing capacitor;

    a switching system for connecting one terminal of said variable sensing capacitor to one of said nodes in a first phase and to the other of said nodes in a second phase; and

    a second terminal of said variable sensing capacitor for receiving a first voltage level in said first phase and a second voltage level in said second phase for transferring the charge on said variable sensing capacitor to said first summing node in said first phase and to said second summing node in said second phase and canceling errors in the differential integrator circuit output caused by leakage current.

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