METHOD AND APPARATUS FOR SUPPRESSING TONES INDUCED BY CYCLIC DYNAMIC ELEMENT MATCHING (DEM) ALGORITHMS

摘要

Disclosed is a method and apparatus for performing Dynamic Element Matching (DEMs 12/14). The method operates to input a plurality of digital values and, for each value, to generate a plurality of N signals intended respectively to drive a plurality of N elements. The plurality of signals are generated (12) so as to average the usage of individual elements over time. The method further rearranges (14) the signals so as to suppress the generation of undesired tones. Periodic rearrangement occurs only at a time when an enable signal that is input to a secondary DEM (14) from a primary DEM (12). Signals are generated by the primary DEM (12) using a cyclic DEM algorithm, and the periodic rearrangment performed by the secondary DEM (14) is preferably based on randomization or pseudo-randomization.