A/D converter including error correction for a local D/A convert

Details A/D converter including error correction for a local D/A convert A/D converter including error correction for a local D/A convert

1991-01-24

1992-03-31

Williams, Howard L.

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

341143, 341118, 375 27, H03M 300

Patent

active

051012057

ABSTRACT:
An A/D converter includes a subtracter for calculating a difference between an input signal and a feed-back signal, and outputting a differential signal, a local A/D converter for converting the differential signal into a first digital signal, a local D/A converter for converting the first digital signal into an analog signal, and outputting the analog signal, as a feedback signal, to the subtracter, an integrator inserted in a feedback loop constituted by the calculator, the local A/D converter, and the local D/A converter, a correcting circuit for correcting the first digital signal output from the local A/D converter so as to obtain a second digital signal corresponding to an analog signal output from the local D/A converter when the first digital signal is input thereto, and an output circuit for outputting the second digital signal, output from the correcting circuit, as an output signal.

REFERENCES:
patent: 4107669 (1978-08-01), Tewksbury
patent: 4540973 (1985-09-01), Grallert
patent: 4588981 (1986-05-01), Senn
patent: 4706261 (1987-11-01), Torre et al.
patent: 4746902 (1988-05-01), Tol et al.
patent: 4772821 (1988-09-01), Suzuki et al.
patent: 4852125 (1989-07-01), Suzuki
patent: 4862169 (1989-08-01), Van Bavel
patent: 4937577 (1990-06-01), Rich et al.
patent: 4977403 (1990-12-01), Larson
patent: 4995059 (1991-02-01), Ishikawa

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