Automatic gain control circuit

Details Automatic gain control circuit Automatic gain control circuit

1978-11-30

1980-08-19

Ng, Jin F.

Telecommunications

Receiver or analog modulated signal frequency converter

Local control of receiver operation

455250, 455253, 455289, 455292, H04B 118

Patent

active

042187745

ABSTRACT:
An automatic gain control circuit for an AM receiver uses a signal having the same wavelength but reversed in phase with the signal in the antenna circuit. A variable resistance attenuator element such as a biased FET or PIN diode is used in the external antenna circuit having a winding to selectively attenuate the input signal to the tuning circuit including a secondary winding. Gain control is performed in an analog manner with respect to the input signal of the external circuit.

REFERENCES:
patent: 3259846 (1966-07-01), Elliott et al.
patent: 3581210 (1971-05-01), Amfahr
patent: 3600684 (1971-08-01), Cherry
patent: 4158814 (1979-06-01), Imazeki et al.

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