High-frequency automatic gain control circuit

Details High-frequency automatic gain control circuit High-frequency automatic gain control circuit

1974-11-19

1976-07-20

Rolinec, R. V.

Amplifiers

Signal feedback

Combined with control of bias voltage of signal amplifier

330 28, 330110, H03G 330

Patent

active

039709493

ABSTRACT:
A high-frequency automatic gain control circuit for a common emitter earthed amplifier wherein a hybrid negative feedback is applied to an input stage thereof from the emitter of an output stage transistor through a hybrid transformer connected to the base of an input stage transistor and a series negative feedback is applied to the output stage thereof, and according to the present invention a diode which is shunted by a capacitor is connected in series to an emitter resistor of the output stage transistor, and an automatic gain control signal is applied to said diode for regulating the gain of said amplifier by controlling negative feedback ratio of said negative feedback.

REFERENCES:
patent: 3624561 (1971-11-01), Tongue
patent: 3731216 (1973-05-01), Nakamura

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