Voltage controlled amplifier

Details Voltage controlled amplifier Voltage controlled amplifier

1978-09-25

1980-09-30

Miller, Jr., Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307230, 328145, 328160, G06G 712

Patent

active

042257948

ABSTRACT:
A voltage controlled amplifier or multiplier circuit including a dual polarity rectifier for dividing the AC input signal into first and second unipolar signals, the first unipolar signal being the positive excursion of the AC input signal and the second unipolar signal being the inverted negative portion of the AC signal. Each unipolar signal is processed through a separate, conventional, unipolar log-antilog amplifier circuit, to each of which is applied a control voltage. The resultant unipolar signals are then subtracted in a differential amplifier to reconstitute the waveform of the original AC input signal, thereby producing the gain-controlled output signal.

REFERENCES:
patent: 3681618 (1972-08-01), Blackmer
patent: 3712989 (1973-01-01), Barton
patent: 3714462 (1973-01-01), Blackmer
patent: 4002977 (1977-01-01), Sun et al.
patent: 4109165 (1978-08-01), Katakura et al.

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