Radio frequency receiving apparatus, radio frequency...

Details Radio frequency receiving apparatus, radio frequency... Radio frequency receiving apparatus, radio frequency...

2008-06-09

2011-11-08

Phu, Sanh (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

Local control of receiver operation

C455S234200, C455S245200, C455S246100, C455S247100, C455S127200, C330S278000, C330S279000

Reexamination Certificate

active

08055232

ABSTRACT:
A receiving apparatus may achieve optimal RF and IF gain control while suppressing saturated amplification due to interference. The receiving apparatus includes an RF variable gain Amp that amplifies a received RF signal, a mixer that converts an output signal of the RF variable gain Amp into an IF signal, an IF variable gain Amp that amplifies the IF signal, a demodulator that demodulates an output signal of the IF variable gain Amp, and an AGC circuit. The AGC circuit sets a period of gain control for the RF variable gain Amp to be shorter than a period of gain control for the IF variable gain Amp when gains of the RF variable gain Amp and the IF variable gain Amp are controlled based on the output signal of the IF variable gain Amp.

REFERENCES:
patent: 6977550 (2005-12-01), Ishida et al.
patent: 7005922 (2006-02-01), Oshima et al.
patent: 7853224 (2010-12-01), Exeter
patent: 2002290178 (2002-10-01), None
patent: 2005102008 (2005-04-01), None

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