Amplifier with modulated resistor gain control
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United States of America Patent
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-
Oct 10, 1989
Grant Date -
N/A
app pub date -
Dec 5, 1988
filing date -
Dec 5, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An automatic gain control circuit for an amplifier operating over a prescribed frequency range detects the output level of the amplifier; and couples a repeated predetermined waveform occurring at a rate greater than the reciprocal of twice the upper frequency of the prescribed frequency range to the output level signal. The waveform varying level signal is compared to a reference threshold to control the gain of the amplifier through a switched resistive elemement in the amplifier feedback path. The repeated waveform variations about the amplifier output level causes the value of the switched resistance to vary as a function of the output level. A low pass filter connected to the amplifier output removes switching transients resulting from the high frequency changes in the switched resistive element. The gains of a plurality of amplifiers may be determined by a common control for accurate tracking over a wide dynamic range.
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