Sigma-Delta Modulator

摘要

A sigma-delta modulator (300) comprising a first filter stage (304); a second filter stage (306) in series with the first filter stage (304); a first feedback path (311) between the output of the second filter stage (306) and the input to the second filter stage (306), the first feedback (311) comprising a first gain stage (308, 308′) such that the first feedback path (311) is configured to provide a first gain value; and a second feedback path (313) between the output of the second filter stage (306) and the input to the first filter stage (304), the second feedback path (313) comprising a second gain stage (309; 310′) such that the second feedback path (313) is configured to provide a second gain value. The first gain value is different to the second gain value.

主权项

1. A sigma-delta modulator comprising:
a first filter stage; a second filter stage in series with the first filter stage; a first feedback path between the output of the second filter stage and the input to the second filter stage, the first feedback path comprising a first gain stage such that the first feedback path is configured to provide a first gain value; and a second feedback path between the output of the second filter stage and the input to the first filter stage, the second feedback path comprising a second gain stage such that the second feedback path is configured to provide a second gain value; wherein the first gain value is different to the gain of the second gain value.