Patent ID: 6426714
Filing Date: 2002-07-30
Classification: H03M

Abstract:
A sigma-delta modulator, comprising:a loop filter having an input node for receiving an analog signal and an output node; a multilevel quantizer having an input node coupled to said output node of said loop filter for receiving an input signal therefrom and a plurality of digital output nodes outputting a multibit digital signal that is indicative of a magnitude of said input signal; and a feedback path from said plurality of digital output nodes of said quantizer to said loop filter, said feedback path comprising at least one dynamic element matching (DEM) switching matrix in series with said feedback path for reordering said multibit digital signal, and a DEM algorithm logic block having outputs coupled to said DEM switching matrix for controlling the operation thereof, said DEM algorithm logic block having an input coupled to said plurality of digital output nodes of said quantizer and being coupled in parallel with at least a portion of said feedback path.