AGC circuit of receiver using several local oscillation...

Details AGC circuit of receiver using several local oscillation... AGC circuit of receiver using several local oscillation...

2006-04-25

2006-04-25

Urban, Edward F (Department: 2685)

Telecommunications

Receiver or analog modulated signal frequency converter

Local control of receiver operation

C455S232100, C455S234100, C375S345000, C330S278000

Reexamination Certificate

active

07035610

ABSTRACT:
An AGC circuit maintains a fixed level for starting AGC operation for an interference wave even if the local oscillation frequency is switched in a receiver that has a plurality of local oscillation frequencies. A frequency correction circuit for correcting the conversion gain characteristic from the antenna input up to the mixer output is provided for the input of a detector within the AGC control loop. The frequency correction circuit is provided with a trap circuit that has a fixed trap frequency by using an LC resonance circuit, for example.

REFERENCES:
patent: 4455681 (1984-06-01), Wile
patent: 5465408 (1995-11-01), Sugayama et al.
patent: 5617060 (1997-04-01), Wilson et al.
patent: 5668839 (1997-09-01), Bernasconi et al.
patent: 6434374 (2002-08-01), Muterspaugh
patent: 6529718 (2003-03-01), Takashima
patent: 6577688 (2003-06-01), Nease
patent: 2004/0153879 (2004-08-01), Fukutani et al.
patent: 2005/0032495 (2005-02-01), Stalf et al.

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