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Switched-capacitor structures with enhanced isolation

  • US 6,859,159 B2
  • Filed: 06/18/2003
  • Issued: 02/22/2005
  • Est. Priority Date: 06/18/2002
  • Status: Active Grant
First Claim
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1. A switched-capacitor stage that operates in a sample mode and a transfer mode, the stage comprising:

  • first and second sample switches;

    a buffer transistor having a control terminal coupled to said first sample switch and also having a current terminal;

    a sample capacitor coupled between said current terminal and second sample switch to thereby receive a sample charge Qs when said first and second sample switches are closed in said sample mode; and

    first and second transfer switches that are respectively coupled to said control and said current terminals to bias off said buffer transistor and transfer at least a portion of said sample charge Qs to said transfer capacitor when said first and second transfer switches are closed in said transfer mode.

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