Patent ID: 8599056
Filing Date: 2013-12-03
Classification: H03M

Abstract:
1. A digital-to-analog converter, comprising: a primary modulator, configured to modulate an input M-bit digital signal into an N-bit digital signal, wherein M and N are positive integers, and M>N; a secondary modulator, connected to the primary modulator, and configured to modulate the N-bit digital signal into a B-bit digital signal, wherein B is a positive integer, and B<N; a delay unit, connected to the primary modulator, and configured to delay the N-bit digital signal; a subtractor, connected to the delay unit and the secondary modulator separately, and configured to subtract the B-bit digital signal output by the secondary modulator from the delayed N-bit digital signal, so as to obtain an (N−B+1)-bit quantization noise signal; a first processing module, configured to perform decoding, dynamic matching, and digital-to-analog conversion in sequence on the B-bit digital signal output by the secondary modulator, so as to obtain a first analog signal; a second processing module, configured to perform decoding, dynamic matching, and digital-to-analog conversion in sequence on the (N−B+1)-bit quantization noise signal output by the subtractor, so as to obtain an analog noise signal; and an adder, connected to the first processing module and the second processing module separately, and configured to add the first analog signal and the analog noise signal, so as to obtain and output a second analog signal.