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Digital-to-analog converter circuit

  • US 7,352,314 B2
  • Filed: 08/15/2006
  • Issued: 04/01/2008
  • Est. Priority Date: 08/16/2005
  • Status: Expired due to Fees
First Claim
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1. A digital-to-analog converter circuit comprising:

  • a plurality of capacitors each provided corresponding to each bit of digital data and having different capacitances from each other which are determined based on weights of the corresponding bits;

    an output unit which outputs an analog voltage determined based on an amount of charge which is a total of charges charged to the plurality of capacitors and a total capacitance of the plurality of capacitors; and

    a charge control transistor which is provided on a route of the digital data to each of the plurality of capacitors and controls supply of a voltage for each bit to the capacitor, wherein the transistor size of the charge control transistor is set corresponding to the capacitance of the capacitor to which the charge control transistor is connected such that the size of the charge control transistor is larger if the capacitor is larger.

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