Delta-sigma modulator with feedback signal modification

摘要

A delta-sigma modulator (1) for converting a delta-sigma modulator input signal into a sequence of delta-sigma modulator output values comprising an actual delta-sigma modulator output value and at least one preceding delta-sigma modulator output value preceding the actual delta-sigma modulator output value is presented. At least one feedback signal modifier for modifying a at least one first feedback signal in dependence of the actual delta-sigma modulator output value and the at least one preceding delta-sigma modulator output value is provided. By means of the at least one first feedback signal modifier the signal quality of a subsequent final stage (7) can be improved.

主权项

1. A delta-sigma modulator comprising
a delta-sigma modulator input for receiving a delta-sigma modulator input signal; a delta-sigma modulator output for providing a sequence of delta-sigma modulator output values; a first delta-sigma modulator stage for forming an integral of the delta-sigma modulator input signal and at least one first feedback signal multiplied with a first coefficient for providing a first stage output signal a final delta-sigma modulator stage for forming an integral of a preceding stage output signal and the at least one first feedback signal multiplied with a second coefficient for providing a final stage output signal a quantizer for quantizing the final stage output signal into the sequence of delta-sigma modulator output values a feedback signal modifier for modifying the at least one first feedback signal as a function of a current delta-sigma modulator output value and one of a at least one preceding delta-sigma modulator output value that is temporaly preceding the current delta-sigma modulator output value.