Methods and apparatus for decorrelating quantization noise in a delta-sigma modulator

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

• a quantizer for quantizing said input signal;
• an adder for determining a quantization error associated with said quantizer by subtracting an input to said quantizer from an output of said quantizer;
• an update block for measuring a correlation coefficient between said quantization error and an input to said quantizer;
• an adder for reducing said measured correlation by subtracting a multiple of said input to said quantizer from said quantization error, wherein said multiple is based on said correlation coefficient;
• an error predictive filter for generating an error prediction value;
• and
• an 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;
• an adder for determining a quantization error associated with said quantizer by subtracting an input to said quantizer from an output of said quantizer;
• an update block for measuring a correlation coefficient between said quantization error and an input to said quantizer;
• an adder for reducing said measured correlation by subtracting a multiple of said input to said quantizer from said quantization error, wherein said multiple is based on said correlation coefficient;
• an error predictive filter for generating an error prediction value;
• and
• an adder for subtracting said error prediction value from said input signal.