Signal processing system having a very long time constant
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United States of America Patent
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Aug 11, 1992
Grant Date -
N/A
app pub date -
Sep 28, 1990
filing date -
Sep 28, 1990
priority date (Note) -
Expired
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Abstract
A switched capacitor integrator is used within the feedback loop of an automatic gain control (AGC) circuit to provide a very long time constant (5 minutes or more) when the amplitude of the gain-controlled signal is within predetermined limits. The time constant is automatically and quickly changed to a much shorter value when the gain-controlled signal is outside the predetermined limits, thereby allowing the AGC circuit to rapidly bring the gain-controlled signal amplitude within the desired range between the predetermined limits. Time constants of orders of magnitude longer than those readily realized with prior art methods of long time-constant filtering are achieved.
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