Automatic gain control circuit for receive apparatus for mobile object
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United States of America Patent
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Sep 11, 2007
Grant Date -
Feb 10, 2005
app pub date -
Jul 29, 2004
filing date -
Jul 31, 2003
priority date (Note) -
In Force
status (Latency Note)
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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.
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