Methods and Apparatus for Whitening Quantization Noise in a Delta-Sigma Modulator Using Dither Signal

A predictive delta-sigma modulator for quantizing an input signal, comprising:

• a quantizer for quantizing said input signal using;
• a noise source for adding a dither signal at a first location of said predictive delta-sigma modulator;
• a comparison circuit for determining a quantization error associated with said quantizer;
• a first adder for removing said dither signal at a second location of said predictive delta-sigma modulator;
• an error predictive filter to generate an error prediction value;
• and
• a second adder for subtracting said error prediction value from said input signal.

An integrated circuit, comprising:

• a predictive delta-sigma modulator for quantizing an input signal, comprising:
• a quantizer for quantizing said input signal using;
• a noise source for adding a dither signal at a first location of said predictive delta-sigma modulator;
• a comparison circuit for determining a quantization error associated with said quantizer;
• a first adder for removing said dither signal at a second location of said predictive delta-sigma modulator;
• an error predictive filter to generate an error prediction value;
• and
• a second adder for subtracting said error prediction value from said input signal.