US 2007/0152858 A1 · DELTA-SIGMA MODULATOR CIRCUIT WITH LIMITER AND METHOD THEREFOR

Abstract

A delta-sigma modulator circuit with limiter and method provide extended dynamic range in noise-shaped pulse generators. A limiting circuit is provided to adjust the output of the quantizer of the delta-sigma modulator according to a given range of values. The range is adjusted in conformity with a stored previous value of the output of the limiter. The circuit permits adjustment of pulse widths in a consecutive-edge modulator (CEM) to correct conditions where a minimum high-state or low-state pulse width would be violated by the commanded output value of the quantizer. The adjusting circuit delays the rising edge of the next pulse if the minimum low state pulse width would not be met and/or extends the falling edge portion of the next pulse if the minimum high-state pulse width would not be met.

Claims20

Dependent claims

A delta-sigma modulator circuit, comprising:

a loop filter;
a quantizer for quantizing an output of said loop filter;
a limiter for limiting output values of said quantizer to a given range of values, and wherein an output of said limiter provides feedback to said loop filter;
and
a storage for storing a previous value of an output of said limiter, and wherein said storage is coupled to said limiter for adjusting said given range of values in conformity with said stored previous value.

2 more elements

Dependencies are inferred from the claim text.

Delta-sigma modulator circuit with limiter and method therefor

Life of this patent

Delta-sigma modulator circuit with limiter and method therefor

Life of this patent

Abstract

Claims20