DC offset correction circuit for A/D converter

Details DC offset correction circuit for A/D converter DC offset correction circuit for A/D converter

1992-09-04

1994-01-25

Williams, Howard L.

Coded data generation or conversion

Converter compensation

341120, 36457101, H03M 106

Patent

active

052819680

ABSTRACT:
The present invention relates to an offset cancellation circuit of digital filtering system which is capable of responding to a variation of an offset value with variation of circuit constant of an A/D converter due to temperature variation, etc. The present offset cancellation circuit is constituted with a low-pass filter for deriving an offset cancellation component from an offset component contained in respective codewords y of output codeword sequence y(kT) (where k is an integer and T is a sampling period of the A/D converter) of a parallel B bits of the offset cancellation circuit at a predetermined ratio every sampling period and accumulating the derived offset cancellation components and an adder for reducing the accumulated offset cancellation components from the input codeword sequence x(kT) of the parallel B bits every sampling period and outputting it as the codeword sequence y(kT). As a result, the whole offset cancellation circuit constitutes a recursive, IIR type digital filter.

REFERENCES:
patent: 4097860 (1978-06-01), Araseki et al.
patent: 4746902 (1988-05-01), Tol et al.
patent: 4943807 (1990-07-01), Early et al.
patent: 5146223 (1992-09-01), Muto
patent: 5177697 (1993-01-01), Schanen et al.
"Digital Filters and Their Applications"; Cappellini et al.; Academic Press pp. 104-160, 1978.
"AK5326/27 16 Bits Oversampling Stereo A/D Converter" Asahi Kasei; Apr. 1989.

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