Patent ID: 6697004
Filing Date: 2004-02-24
Classification: H03M

Abstract:
A mismatch-shaping digital-to-analog converter (DAC) partially spectrally shaping conversion noise, wherein the DAC converts a digital input signal to a nominally equivalent analog output signal, comprising:(a) a signal divider block for splitting the input signal into a first and a second signal component; (b) a mismatch-shaping DAC block having an input adapted to receive the first component, wherein the mismatch-shaping DAC block spectrally shapes the first component and provides the spectrally shaped first component as inputs to a first plurality of internal DAC elements; (c) a DAC block having an input adapted to receive the second component, wherein the DAC block includes a second plurality of internal DAC elements, and wherein each of the DAC elements generate an analog output signal nominally equivalent to the signal presented at its respective input; and (d) an adder, coupled to the outputs of the DAC elements, wherein the adder outputs the analog output signal, wherein no spectral shaping is performed on the second component of the input signal.