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Digital-to-analog converter

  • US 7,474,245 B1
  • Filed: 09/13/2007
  • Issued: 01/06/2009
  • Est. Priority Date: 09/13/2007
  • Status: Expired due to Fees
First Claim
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1. A digital-to-analog converter outputting an output analog voltage according to an N-bit digital signal, the digital-to-analog converter comprising:

  • a first resistor string connected between a first and a second power supply voltages to generate a first group of reference voltages between the first and second power supply voltages;

    a first select unit selecting two reference voltages out of the first group according to M most significant bits of the N-bit digital signal;

    a plurality of buffer amplifiers configured to receive the first group of reference voltages and output said first group to the first select unit;

    a second resistor string connected between the selected reference voltages to generate a second group of reference voltages between the selected reference voltages; and

    a second select unit selecting one reference voltage out of the second group as the output analog voltage according to the N-M least significant bits of the N-bit digital signal.

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