Phase control circuit including an operational transconductance

Details Phase control circuit including an operational transconductance Phase control circuit including an operational transconductance

1975-10-24

1976-11-30

Grimm, Siegfried H.

Modulators

Amplitude modulator

Nonlinear device controlled by modulating signal

84 125, 307262, 328155, 331108D, 331143, 332 23R, G10H 104, H03C 300, H03C 500

Patent

active

039952355

ABSTRACT:
A phase control circuit includes an amplifier having a signal combining output, an inverting input signal supplied via a first coupling path with signals to be phase controlled, and a non-inverting input supplied via a second coupling path with such signals, the second coupling path including a reactive element and a variable admittance device. The variable admittance device comprises an operational transconductance amplifier exhibiting a controllable linear transconductance characteristic and an output admittance which varies proportionally to the transconductance in response to applied bias current. Variation of the bias current in a predetermined manner produces a corresponding variation in phase shift imparted to signals provided at the signal combining output.

REFERENCES:
patent: 3263019 (1966-07-01), Hurvitz
patent: 3597639 (1971-08-01), Harwood
patent: 3719782 (1973-03-01), Barnum
patent: 3795756 (1974-03-01), Suzuki

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