Automatic gain control circuit for selectively providing an accu

Details Automatic gain control circuit for selectively providing an accu Automatic gain control circuit for selectively providing an accu

1996-10-22

1998-12-08

Mottola, Steven

Amplifiers

With semiconductor amplifying device

Including gain control means

330281, H03G 330

Patent

active

058476091

ABSTRACT:
An AGC circuit varies a bandwidth of an input unit and accuracy of linearity of the AGC output. A first input unit converts a first input current into a first voltage. A second input unit, identical to the first input unit, converts a second input current into a second voltage. A variable constant current source generates first and second constant currents. The first constant current flows from the first input unit to the variable constant current source. The second constant current flows from the second input unit to the variable constant current source. The first and second constant currents are varied by a control signal supplied by an external signal source so that the bandwidths of the first and second input units are varied. The AGC output of the AGC circuit is calculated based on the first voltage and the second voltage.

REFERENCES:
patent: 5432474 (1995-07-01), Lauffenburger et al.

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