AGC circuit of FM front-end portion for controlling bandwidth de

Details AGC circuit of FM front-end portion for controlling bandwidth de AGC circuit of FM front-end portion for controlling bandwidth de

1991-07-03

1994-11-29

Urban, Edward F.

Telecommunications

Receiver or analog modulated signal frequency converter

Local control of receiver operation

4552461, 4552491, 230284, H04B 116

Patent

active

053697928

ABSTRACT:
According to this invention, there is disclosed an AGC circuit of an FM front-end portion, including an attenuator for attenuating an input signal in accordance with a level of a first signal, an amplifier for amplifying the input signal in accordance with a level of a second signal, a first input amplitude control circuit for outputting third and fourth signals in accordance with a receiving electric field strength of a receiver, a receiving electric field detecting circuit for outputting a fifth signal in accordance with an amplitude of an IF signal in the receiver, and a second input amplitude control circuit for adjusting levels of the first and second signals by changing the third and fourth signals in accordance with the fifth signal.

REFERENCES:
patent: 4030035 (1977-06-01), Ienaka et al.
patent: 4538300 (1985-08-01), Richards, Jr.
patent: 4955073 (1990-09-01), Sugayama
patent: 4955077 (1990-09-01), Sugayama
patent: 5175883 (1992-12-01), Ueno

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