Automatic gain control circuit for receive apparatus for...

Details Automatic gain control circuit for receive apparatus for... Automatic gain control circuit for receive apparatus for...

2007-09-11

2007-09-11

Nguyen, Tony T. (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

Plural receivers

C455S232100, C455S245100

Reexamination Certificate

active

10901288

ABSTRACT:
An automatic gain control circuit for a receive apparatus for a mobile object which automatically controls the gain of a variable gain amplifier amplifying a received signal from an antenna installed in the mobile object and outputting the amplified signal to the receive apparatus. The circuit comprises an intensity detector that detects an intensity of the received signal; a comparator that compares the detected intensity with first and second threshold voltages; and a controller that outputs a control signal for adjusting the gain to the variable gain amplifier based on the comparing results of the comparator so that the gain of the variable gain amplifier has a hysteresis with respect to the intensity of the received signal.

REFERENCES:
patent: 4335361 (1982-06-01), Acker
patent: 4461025 (1984-07-01), Franklin
patent: 5269289 (1993-12-01), Takehana et al.
patent: 7031409 (2006-04-01), Brobston et al.
patent: 2003-125012 (2003-04-01), None

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