Dithered analog-to-digital converter

Details Dithered analog-to-digital converter Dithered analog-to-digital converter

1994-12-14

1996-02-20

Hoff, Marc S.

Coded data generation or conversion

Analog to or from digital conversion

Increasing converter resolution

341131, 341118, H03M 120

Patent

active

054932980

ABSTRACT:
A dithered analog-to-digital converter includes a correlator to detect dither residue in the output signal. The correlator output is accumulated and used in a feedback loop to control the gain of the dither signal so as to null the residue. Problems associated with the low bandwidth of the feedback loop, and corruption of the accumulator value due to overload, are addressed by provision of a preload register from which the accumulator is initialized on power-up and on detection of an overload. This approach provides quick settling time and avoids statistical anomalies associated with decimation approaches to overload.

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patent: 5189418 (1993-02-01), Bartz et al.
Honig, et al., Adaptive Filters, excerpt from book, Sections 3.1 and 3.2, pp. 48-53, 1985.

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