Variable gain amplifier circuit
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United States of America Patent
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Dec 3, 1996
Grant Date -
N/A
app pub date -
Jun 7, 1995
filing date -
Jun 7, 1995
priority date (Note) -
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status (Latency Note)
Importance
Abstract
A non-attenuating automatic variable gain amplifier (VGA) circuit includes an operational amplifier (op amp) with a feedback resistor connected between its output and inverting input terminals. A variable gain setting resistance circuit having a variable resistance is the gain setting resistor positioned between the op amp's inverting input and a low voltage supply. By varying the resistance of the variable resistance circuit, the gain of the VGA circuit can be manipulated without requiring attenuation of the input signal. A resistance setting control for the variable resistance circuit can operate open loop, fed back from the amplifier output, or fed forward from the amplifier input.
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