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Current digital-to-analog converter reducing flicker noise

  • US 9,450,599 B1
  • Filed: 03/01/2016
  • Issued: 09/20/2016
  • Est. Priority Date: 06/24/2015
  • Status: Expired due to Fees
First Claim
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1. A current digital-to-analog converter (DAC) circuit, comprising:

  • a reference current source providing a reference current to a first node;

    a current mirror including first and second PMOS transistors, the first and second PMOS transistors being configured to provide a copy current generated based on copying the reference current to a second node, the first and second PMOS transistors being coupled, at respective drains, to separate nodes of the first and second nodes, the current mirror being configured to periodically swap the separate nodes to which the respective drains of the first and second PMOS transistors are connected according to first and second clock signals;

    a decoder configured to generate at least one enable signal based on a data input signal; and

    at least one current DAC unit, each current DAC unit being configured to generate a separate positive current and a separate negative current based on the copy current and a separate enable signal of the at least one enable signal.

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