System and method using dither to tune a filter

Details System and method using dither to tune a filter System and method using dither to tune a filter

2006-05-09

2006-05-09

Barnie, Rexford (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Increasing converter resolution

C341S143000, C341S155000

Reexamination Certificate

active

07042375

ABSTRACT:
A system and method is used to tune filters, for example, analog filters in a sigma-delta modulator ADC. A known dither signal is used, for example a digital dither signal. Through adding of the dither to the modulator loop, the digital output of the sigma delta modulator ADC contains a filtered version of the digital dither. This signal can be used to reveal characteristics of the modulator-loop, including characteristics of a continuous-time filter in the modulator. Therefore, using the known digital dither signal and the output signal of the modulator, the continuous-time loop filter can be tuned. The tuning can be done in multiple ways, for example, by using standard LMS adaptive filter techniques to estimate the actual response of the continuous-time loopfilter and adjust the continuous-time loopfilter to the desired response.

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Crawford, D.,Adaptive Filters,at http://www.spd.ee.strath.ac.uk/˜david/adapt—filt/adapt—filt.html, 6 pages (Copyright 1996), no month.

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