Patent ID: 6348886
Filing Date: 2002-02-19
Classification: H03M

Abstract:
A digital-to-analog converter (DAC) circuit for converting an n-bit digital input signal to an analog output signal, the DAC comprising:means for generating a self-calibration signal based on a predetermined pattern of digital input data; and means, responsive to the self-calibration signal, for generating an internal variable DAC control reference voltage based on full scale output voltage amplitudes; means, responsive to the self-calibration signal, for placing an output amplifier that outputs the output signal, in a hold mode during an active mode of the self-calibration; and wherein the means for generating a variable DAC control reference voltages includes: full scale output detection means for detecting an amplitude of converted analog output data; and switchable means, operatively responsive to the self-calibration signal, for varying the variable DAC control reference voltage based on predetermined digital input data patterns.