Alternating comparator circuitry for improved discrete sampling

Details Alternating comparator circuitry for improved discrete sampling Alternating comparator circuitry for improved discrete sampling

1983-12-27

1985-04-23

Pellinen, A. D.

Electrical transmission or interconnection systems

Switching systems

Condition responsive

307310, 323245, H01H 4700

Patent

active

045132070

ABSTRACT:
A pair of comparators, each having the same reference potential at a first input, each have a second input alternatingly receiving different ones of first and second signals relating to the magnitude of a parameter to be controlled. The results of a first comparison, with a first parameter signal connected to the input of the first comparator and the second comparator receiving the remaining parameter signal, is commutated by comparator output circuitry to means for realizing the algebraic difference of the signals and for intermediately storing this difference. During a second sampling period, when the inputs are reversed, the algebraic difference circuitry provides another set of signals to the intermediate storage circuit, which second set of signals have parametric changes of opposite direction and substantially equal magnitude to errors introduced by the comparators during the first sampling, such that the intermediately-stored algebraic difference of the two sample sets is substantially free of any effects due to input offset and other errors between the pair of comparators.

REFERENCES:
patent: 4117355 (1978-09-01), Fleischer
patent: 4375595 (1983-03-01), Ulmer et al.
patent: 4421993 (1983-12-01), Bloomer
patent: 4461990 (1984-07-01), Bloomer

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