Automatic gain controller

Details Automatic gain controller Automatic gain controller

1993-10-19

1994-10-04

Mottola, Steven

Amplifiers

With control of power supply or bias voltage

With control of input electrode or gain control electrode bias

330281, H03G 320

Patent

active

053529880

ABSTRACT:
An automatic gain controller includes a signal detector receiving an output signal from an amplifier for converting the signal into a DC current changing according to the output signal; first and second time-constant controllers receiving the DC current for removing an AC component to produce first and second pure DC components with different, predetermined time-response characteristics; a voltage subtracter receiving and subtracting the first and second pure DC components to produce a resultant voltage; a voltage comparator for comparing the resultant voltage with a predetermined reference voltage; a switch responsive to the voltage comparator for controlling transmission of the first pure DC component; a voltage sink for discharging the first pure DC component when the switch is closed; and a control voltage amplifier receiving the first pure DC component when the switch is open for producing an output signal to control the gain of the receiving amplifier. Accordingly, high-speed and reliably stable gain control can be achieved.

REFERENCES:
patent: 4521738 (1985-06-01), Akagiri et al.

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