Base band circuit of receiver and low cut-off frequency...

Details Base band circuit of receiver and low cut-off frequency... Base band circuit of receiver and low cut-off frequency...

2007-08-14

2007-08-14

Ha, Dac V. (Department: 2611)

Pulse or digital communications

Receivers

Automatic gain control

C375S317000, C375S319000, C455S226200, C455S234100, C455S250100, C455S251100, C330S254000, C330S278000

Reexamination Certificate

active

10341420

ABSTRACT:
A base band circuit of a receiver and a low cut-off frequency control means can quickly converge transition state due to gain fluctuation with setting a low cut-off frequency of a high-pass filter as low as possible. The base band circuit of a receiver has a variable amplifier variably amplifying a base band signal depending upon a gain control signal, a high-pass filter provided in a path of the base band signal, and a controller detecting variation magnitude of the gain control signal and controlling variation of a low cut-off frequency of the high-pass filter means depending upon the detected variation magnitude.

REFERENCES:
patent: 5757247 (1998-05-01), Koukkari et al.
patent: 6449471 (2002-09-01), Katsura et al.
patent: 7003271 (2006-02-01), Kluge et al.
patent: 7062244 (2006-06-01), Gharpurey et al.
patent: H08-307465 (1996-11-01), None
patent: WO 01/47105 (2001-06-01), None

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