Impedance matched variable gain low noise amplifier using shunt feed-back
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United States of America Patent
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Nov 27, 2007
Grant Date -
Jun 15, 2006
app pub date -
Dec 7, 2005
filing date -
Dec 13, 2004
priority date (Note) -
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Abstract
The variable gain amplifier includes a forward path that provides the amplifier variable gain, and a feedback path. The feedback path uses a switch that is turned on at low gain levels. The switch taps into the feedback resistor, shunting it to signal-ground and eliminating the feedback mechanism. This ensures that the input impedance seen at the input port does not grow excessively, using part of the feedback resistor as a passive termination at low gain levels. In this way variable gain ranges in excess of 30 dB can be achieved.
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