Electronic multiplying circuits

Details Electronic multiplying circuits Electronic multiplying circuits

1979-04-13

1980-12-30

Krawczewicz, Stanley T.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Plural inputs

307225R, 328160, G01R 2106

Patent

active

042426340

ABSTRACT:
An electronic multiplying circuit, primarily intended for use in an electronic watthour meter, comprises a variable-transconductance multiplier of the type comprising two emitter-coupled pairs of transistors, the collectors of one pair being cross-coupled with the collectors of the other pair. In order to permit the effective polarity of one of the input signals to the multiplier to be reversed from time to time for drift correction purposes, this input signal is applied to a semiconductor switching circuit, which applies it alternately to the respective bases of a further emitter-coupled pair of transistors. The collectors of the transistors of this further pair are connected in series with the coupled emitters of respective ones of the emitter-coupled pairs in the variable-transconductance multiplier.

REFERENCES:
patent: 2661457 (1953-12-01), Boast et al.
patent: 3432650 (1969-03-01), Thompson
patent: 3440441 (1969-04-01), Ley
patent: 3500200 (1970-03-01), Woodhead
patent: 3906246 (1975-09-01), Okada
patent: 4053832 (1977-10-01), Nelson

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