Automatic gain control device for producing constant amplitude o

Details Automatic gain control device for producing constant amplitude o Automatic gain control device for producing constant amplitude o

1995-08-24

1997-02-25

Mullins, James B.

Amplifiers

With control of power supply or bias voltage

With control of input electrode or gain control electrode bias

330 51, 330135, 330136, 330279, 455126, H03G 320

Patent

active

056062842

ABSTRACT:
A variable gain amplifying circuit is controlled by a control voltage Vc from which a high-frequency component has been removed. To provide the control voltage Vc, a holding circuit smoothes the higher one of an output voltage of the variable gain amplifying circuit, which has been rectified by a rectifying circuit, and a voltage detected by a minute voltage detecting circuit, so that the control voltage Vc is obtained via a direct-current amplifying circuit. Since the clamping circuit varies the control voltage Vc based on a reference voltage Vref on receiving a minute input signal, even when an AGC characteristic is changed by varying the reference voltage Vref, the minimum gain is always corrected to be constant.

REFERENCES:
patent: 4360787 (1982-11-01), Galpin
patent: 4371842 (1983-02-01), Lee
patent: 4574248 (1986-03-01), Snodgrass
patent: 4760347 (1968-07-01), Li et al.

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