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Flexible sample rate converter for multimedia digital-to-analog conversion in a wireless telephone

  • US 6,563,448 B1
  • Filed: 04/29/2002
  • Issued: 05/13/2003
  • Est. Priority Date: 04/29/2002
  • Status: Active Grant
First Claim
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1. A digital-to-analog converter, comprising:

  • a dual frequency divider, for dividing a system clock signal by a divisor selected from a pair of adjacent integers, to produce a sampling clock;

    a first sigma-delta modulator, for selecting the divisor for the dual frequency divider;

    a second sigma-delta modulator, for selecting an oversampling multiple from a pair of adjacent integers;

    a sampling latch, for sampling an input digital datastream synchronously with the sampling clock;

    a digital filter, having an input receiving the sampled input digital datastream and an input receiving the selected oversampling multiple in the form of a digital word, for generating a reconstructed datastream corresponding to the input digital datastream; and

    a digital-to-analog converter circuitry for producing an analog signal from the reconstructed datastream.

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