Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1980-01-08
1982-02-23
Miller, Jr., Stanley D.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307492, 328 26, 328145, 363 44, 363125, H03K 500, H02M 700
Patent
active
043170528
ABSTRACT:
Offset voltages of a precision rectifier circuit, buffer amplifiers, and an input comparator of a log converter are compensated for by charging a coupling capacitor to the combined total offset voltage of the apparatus. The charging is effected by causing the comparator to operate as a unity gain inverting amplifier during part of the operating cycle of the log converter when the comparator output signal is not used, so that the log converter operation is not adversely affected. During such charging the input of the precision rectifier circuit, to which the a.c. input signal is normally applied, is grounded. Throughout the charging and associated switching operations a capacitor of a smoothing filter connected following the precision rectifier circuit is disconnected from ground to isolate the smoothing filter output from ground and to prevent switching transients from affecting the charge of this capacitor.
REFERENCES:
patent: 3942095 (1976-03-01), Togneri et al.
patent: 4013955 (1977-03-01), Wagner
patent: 4109308 (1978-08-01), Rodel
EDN Design Awards, Full-Wave Rectifier Need Only Two Precision Resistors, by Steve Smith, Jan. 5, 1975, p. 56.
EDN, Measure Differential A.C. Signals Easily with Precision Rectifier by J. Graeme, Jan. 20, 1975, pp. 45-48.
Davis B. P.
Miller, Jr. Stanley D.
Northern Telecom Inc.
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