Coded data generation or conversion – Converter compensation
Patent
1996-02-12
1997-10-07
Hoff, Marc S.
Coded data generation or conversion
Converter compensation
341143, 341155, H03M 106
Patent
active
056753349
ABSTRACT:
An analog to digital conversion system wherein a first chopper is responsive to a chop signal having a period T for passing an analog signal to an output with non-reversed polarity during a first portion of the period T and with reversed polarity during a second portion of the period T. An analog to digital converter produces a first set of at least one digital word corresponding to the analog signal with non-reversed polarity and an offset voltage and produces a second set of at least one digital word corresponding to the analog signal with reversed polarity and the offset voltage. A second chopper is responsive to the chop signal for passing to an output of the second chopper one of the produced first and second sets with non-reversed polarity, and passing to the output of the second chopper the other one of produced first and second sets with reversed polarity. A filter is fed by the output of the second chopper for producing, on receipt of the produced first set, a first output digital word and, on receipt of the produced second set, a second output digital word, with the offset voltage being removed from each of such output digital words. In a preferred embodiment, a signal conditioning circuit is fed by the output of the first chopper.
REFERENCES:
patent: 4608553 (1986-08-01), Ormond
patent: 5039989 (1991-08-01), Welland et al.
patent: 5148167 (1992-09-01), Ribner
patent: 5179380 (1993-01-01), White
Jerome Johnston, "Signal Chopping Enhances Bridge Performance", EDN Jun. 22, 1995, p. 70.
Analog Devices Inc.
Hoff Marc S.
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