Dither signal insertion inversely proportional to signal level in delta-sigma modulators

摘要: A method is disclosed to operate a sigma-delta modulator of type that includes quantizer. The has steps (a) sampling an amplitude input signal the modulator; and (b) controlling switching capacitance bank in accordance with sampled for generating dither at generated have pseudorandom inversely proportional signal. step operates linear feedback shift register switch individual ones plurality capacitances out network. In one embodiment operating least turns clock on off as function window detector, turned depending relationship between voltage thresholds detector. another rectifier rectifies provide rectified output signal, pseudorandomly applies amount current transferred quantizer capacitances.