Analog to digital converter with increased sub-range resolution

A method for operating a communication device comprising:

• producing an analog communication signal by an analog front end;
• sampling a full-range of the analog communication signal by a full-range ADC having a first quantization accuracy to produce a full-range ADC output;
• sampling a central sub-range of the analog communication signal by a central sub-range ADC having a second quantization accuracy greater than the first quantization accuracy to produce a central sub-range ADC output;
• and
• processing outputs of the full-range ADC output and the central sub-range ADC output to create a digital communication signal.

An Analog to Digital Converter (ADC) that samples an analog signal comprising:

• a full-range ADC having a first quantization accuracy configured to sample the analog communication signal across a full-range;
• a central sub-range ADC having a second quantization accuracy greater than the first quantization accuracy and configured to sample the analog communication signal across a central sub-range of the full-range;
• and
• signal combining circuitry configured to process outputs of the full-range ADC and the central sub-range ADC to create a digital communication signal.