Automatic gain control circuit capable of compensating variation

Details Automatic gain control circuit capable of compensating variation Automatic gain control circuit capable of compensating variation

1996-07-24

1998-04-28

Au, Amelia

Telecommunications

Receiver or analog modulated signal frequency converter

Local control of receiver operation

4552451, 4552471, 330279, H04B 106, H04B 116

Patent

active

057458472

ABSTRACT:
An RF AGC control circuit (47) gives a first initial voltage signal generated by a first initial level generating circuit (44) to an RF amplifier circuit (22) during a predetermined time duration T, when the channel selection signal was updated or when power supply is turned to on. After lapse of the predetermined time duration T, the RF AGC control circuit gives to the RF amplifier circuit a level difference signal representative of a level difference between output of an optimum level generating circuit (46) and output of a comparator (43). On the other hand, an IF AGC control circuit (48) gives a second initial voltage signal generated by a second initial level generating circuit (45) to an IF amplifier circuit 31 during the predetermined time duration T, when the channel selection signal was updated or when the power supply is turned to on. The IF AGC control circuit gives the output of the comparator to the IF amplifier circuit after lapse of the predetermined time duration T.

REFERENCES:
patent: 4580287 (1986-04-01), Richards, Jr.
patent: 4955077 (1990-09-01), Sugayama
patent: 5507023 (1996-04-01), Suganuma et al.
patent: 5513387 (1996-04-01), Saito et al.
patent: 5659582 (1997-08-01), Kojima et al.

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