Automatic gain control arrangement useful in an FM radio receive

Details Automatic gain control arrangement useful in an FM radio receive Automatic gain control arrangement useful in an FM radio receive

1980-04-24

1983-05-24

Chin, Tommy P.

Telecommunications

Receiver or analog modulated signal frequency converter

Local control of receiver operation

455234, 455251, H04B 126

Patent

active

043854001

ABSTRACT:
In an FM receiver including a plurality of cascaded amplifier stages for successively amplifying an IF signal to form a pulse signal which is demodulated to derive an audio signal, an auxiliary amplifier section beside the cascade is provided to amplify a signal developed at an intermediate point in the cascade to form a signal from which a control signal for controlling the gain of an RF amplifier. The auxiliary amplifier section includes a first linear amplifier including degenerative signal feedback followed in cascade by a second linear amplifier including a gain control arrangement. The latter is responsive to a logarithmic gain control signal generated by a logarithmic amplifier in response to the output signal of a peak detector following the auxiliary amplifier. The control signal has a relatively wide control range, e.g., 10 to 500 microvolts of RF input signal, suitable for controlling the gain of an RF stage.

REFERENCES:
patent: 3167713 (1965-01-01), Bastian
patent: 3673499 (1972-06-01), Avins
patent: 3689752 (1972-09-01), Gilbert
patent: 4186351 (1980-01-01), Brefini
patent: 4263560 (1981-04-01), Ricker
Linear Integrated Circuits-CA3089E FM IF System, RCA Solid State Division, Supersedes Issue Date 8-72, Printed 6/78.
Linear Integrated Circuits-CA3189E FM IF System, RCA Solid State _Divison, Supersedes Issue Date 11-77, Printed 9-78.

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