Delta-sigma modulator circuit with limiter and method therefor

Details Delta-sigma modulator circuit with limiter and method therefor Delta-sigma modulator circuit with limiter and method therefor

2007-03-16

2008-09-30

Jeanglaude, Jean B. (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

C341S144000

Reexamination Certificate

active

07429940

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.

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