A sigma-delta modulator is disclosed for conversion of an analog or digital low frequency signal of high resolution into a quantized analog or digital signal, with an error feedback circuit for suppression of quantization errors. The sigma-delta modulator includes a delay device (Z.sup.-1) for delaying...http://www.google.com/patents/US6249238?utm_source=gb-gplus-sharePatent US6249238 - Sigma-delta modulator and method for suppressing a quantization error in a sigma-delta modulator
