Variable gain amplifier circuit and its use in an automatic gain

Details Variable gain amplifier circuit and its use in an automatic gain Variable gain amplifier circuit and its use in an automatic gain

1987-10-23

1989-01-10

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including gain control means

330277, 330260, H03G 330

Patent

active

047976322

ABSTRACT:
An amplifier circuit whose input stage (1) has a variable gain and a DC voltage level on its load resistor (Rc), which is stabilized with the aid of means comprising a DC current generator (S), which varies contrary to the average output current of this input stage (1) and which for this purpose supplies a complementary current (I.sub.2) on this load resistor (Rc).
The stabilizing means furthermore comprise a high gain differential amplifier (A) of which an input (15) is connected to the active terminal (11) of the load resistor (Rc) and whose output signal is used for the current generator control (S) via a low-pass filter (F) such that that complementary current (I.sub.2) is applied as negative feedback to the input (15) of the differential amplifier (A). An automatic gain control device which utilizes this amplifier circuit is also shown.

REFERENCES:
patent: 3469195 (1969-09-01), Harwood
patent: 4590613 (1986-05-01), Tannery

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