Signal processing system having a very long time constant

Details Signal processing system having a very long time constant Signal processing system having a very long time constant

1990-09-28

1992-08-11

LaRoche, Eugene R.

Amplifiers

With semiconductor amplifying device

Including gain control means

330284, 330290, H03G 310

Patent

active

051382776

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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