Delta-sigma modulator coefficient calibration method and...

Details Delta-sigma modulator coefficient calibration method and... Delta-sigma modulator coefficient calibration method and...

2007-05-22

2007-05-22

Nguyen, Khai M. (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

C341S118000, C341S120000, C341S131000

Reexamination Certificate

active

11312842

ABSTRACT:
A delta-sigma modulator coefficient calibration method and apparatus provides for adjustment of the modulator coefficients, and thus the modulator noise transfer function (NTF), in operational environments. A noise signal is injected into the feedback loop of the delta-sigma modulator either before or after the quantizer and the output of the modulator is correlated with the noise signal. The delta-sigma modulator has adjustable coefficients that are adjusted in conformity with the correlator output to achieve a more desirable noise transfer function. The correlator may include a tapped delay line and multiple correlators for simultaneously measuring each modulator coefficient directly, or may include a variable delay and a single correlator for measuring each coefficient sequentially.

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