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Fast testing of D/A converters

  • US 5,841,382 A
  • Filed: 03/19/1997
  • Issued: 11/24/1998
  • Est. Priority Date: 03/19/1997
  • Status: Expired due to Term
First Claim
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1. An integrated circuit having a D/A converter, comprising:

  • (a) a plurality of resistors configured in a resistor string and adapted to receive two reference voltages;

    (b) a plurality of switches connected to the plurality of resistors;

    (c) decoder circuitry adapted to control the switches based on a code value to generate a corresponding tap voltage;

    (d) an output amplifier configured to generate an analog output voltage based on the tap voltage;

    (e) a normal-mode capacitor coupled to an input of the output amplifier to reduce power consumption during normal-mode operation of the D/A converter; and

    (f) a test-mode capacitor switchably coupled to the normal-mode capacitor to reduce settling time during test-mode operation of the D/A converter.

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