Amplifier circuit for an intermediate-frequency signal of a radi

Details Amplifier circuit for an intermediate-frequency signal of a radi Amplifier circuit for an intermediate-frequency signal of a radi

1997-12-04

1999-03-23

Chin, Wellington

Telecommunications

Receiver or analog modulated signal frequency converter

Local control of receiver operation

455260, 4552342, 4551803, 455255, H04B 106

Patent

active

058872469

ABSTRACT:
The circuit (7, 8, 9, 10) comprises, in addition to the automatic gain control (AGC), a gain reduction means for controlling the gain of an amplifier (8), intended to avoid the desynchronization of the local oscillator (7) controlled by a phase-locked loop comparator (12). This is controlled by a peak detector of the amplified signal situated at the output of the amplifier (8).

REFERENCES:
patent: 4292598 (1981-09-01), Yasumura
patent: 4360929 (1982-11-01), Isobe
patent: 4691377 (1987-09-01), Yoshihara et al.
patent: 4812908 (1989-03-01), Frequin
patent: 4827511 (1989-05-01), Masuko
patent: 4884142 (1989-11-01), Hyakutake et al.
patent: 5365279 (1994-11-01), Harford
patent: 5440586 (1995-08-01), Den Braber
patent: 5630215 (1997-05-01), Waldie et al.

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