Patent ID: 6535154
Filing Date: 2003-03-18
Classification: H03M

Abstract:
A digital-to-analog converter circuit configured to oversample a multi-bit digital input signal and generate an analog output signal representative of the digital input signal, comprising:(a) a plurality of modulator circuits each configured to receive a digital input signal and generate a corresponding one of a plurality of control signals, at least some of the plurality of the control signals each having an error component and an error cancellation component for correcting an error component of another of the control signals; (b) a plurality of digital-to-analog converter elements having associated weighting elements, the digital-to-analog converter elements being configured to generate a plurality of weighted signals to be summed to produce the analog output signal in response to the plurality of respective control signals, respectively, the polarity of each weighted signal summed to produce the analog output signal being determined by the control signals, respectively; and (c) a processing circuit configured to receive the multi-bit digital input signal and generate the digital input signals received by the plurality of modulator circuits, wherein the digital input signals received by some of the modulator circuits each include an error cancellation component corresponding to an error component in a control signal produced by another of the modulator circuits.