Patent ID: 6326911
Filing Date: 2001-12-04
Classification: H03M

Abstract:
A system for attenuating idle channel tones in a delta-sigma analog-to-digital converter comprising:a delta-sigma analog-to-digital converter comprising:a sampler operable to receive an analog signal and process it into discrete segments, the sampler having an input and output;an analog delta-sigma modulator comprising:at least one integrators operable, having an input and an output and operable to process the analog signal from the output of the sampler;a quantizer having an input and an output and operable to quantize the output of the integrator;a dither current generator coupled before the input of the quantizer and comprising:a random number generator operable to generate a random digital number;a digital-to-analog converter coupled to the random number generator and operable to convert a random digital number into a dither current; andwherein the dither current produced by the dither current generator randomly changes the output of the quantizer such that idle channel tones are attenuated.