Drift cancellation circuit for multiplexer amplifier

Details Drift cancellation circuit for multiplexer amplifier Drift cancellation circuit for multiplexer amplifier

1977-01-03

1978-03-07

Stewart, David L.

Communications: electrical

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Internal alarm or indicator responsive to a condition of the...

340177CA, H04J 304

Patent

active

040781569

ABSTRACT:
Herein described is a drift cancellation circuit for signal amplifiers used in multiplexed data monitoring systems. The effect of analog drift is essentially cancelled and the need for an initial or periodic zero adjustment is eliminated. The elimination of the need for drift adjustment is accomplished at the analog to digital A/D converter of the mutiplexer. The A/D converter is encircuited to measure the difference between the measured input channel and a referenced voltage obtained from a sample-hold circuit. Input to the sample-hold circuit is taken from the output to the signal amplifier chain used in processing incoming channel data.

REFERENCES:
patent: 3059228 (1962-10-01), Beck
patent: 3619511 (1971-11-01), Ishikawa
patent: 4056686 (1977-11-01), Zielinski
1970 Wescon Technical Papers, vol. 14, pp. 14/1-1 to 14/1-8; "A Low Level, High Speed, Solid State Multiplexer . . . " by Hartke.

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