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Switched capacitor one-bit digital-to-analog converter

  • US 5,323,158 A
  • Filed: 04/06/1993
  • Issued: 06/21/1994
  • Est. Priority Date: 04/06/1993
  • Status: Expired due to Term
First Claim
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1. A switched capacitor one-bit digital-to-analog converter comprising:

  • first and second capacitors, each having a first lead and a second lead;

    first switching means connected to the first leads of said capacitors for coupling charge from a reference source to said capacitors;

    second switching means connected to the second leads of said capacitors for coupling charge from said capacitors to a positive output and a negative output, comprising a first switch connected between said first capacitor and said positive output, a second switch connected between said second capacitor and said negative output, a third switch connected between said first capacitor and said negative output, and a fourth switch connected between said second capacitor and said positive output;

    means for applying a first control signal to said first and second switches, said first control signal comprising Φ

    2

    X+Φ

    1

    XI, where Φ

    1 and Φ

    2 represent clock phase 1 and clock phase 2, respectively, X and XI represent input data and inverted input data, respectively, "•

    " represents a logical AND operation, and "+" represents a logical OR operation; and

    means for applying a second control signal to said third and fourth switches, said second control signal comprising Φ

    1

    X+Φ

    2

    XI.

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