Method and circuit for controlling the output signal of a variab

Details Method and circuit for controlling the output signal of a variab Method and circuit for controlling the output signal of a variab

1978-04-21

1979-12-18

Dahl, Lawrence J.

Amplifiers

With control of power supply or bias voltage

With control of input electrode or gain control electrode bias

320 1, 323 93, 330280, H03G 320

Patent

active

041796667

ABSTRACT:
The output voltage of a variable control circuit, such as a variable gain amplifier, (20, FIG. 1), is controlled by a circuit interconnected in the feedback circuit of the amplifier. The circuit determines whether the output voltage falls within a predetermined range by comparing (201, FIG. 2) the output voltage with a reference voltage. If the output voltage falls within the predetermined range, a capacitor (207) is charged. Interconnected with a control input lead (72) of the variable gain amplifier (20), the charge on the capacitor controls the output voltage produced by the variable gain amplifier.

REFERENCES:
patent: 3259849 (1966-07-01), Willett et al.
patent: 3440543 (1969-04-01), Polzl
patent: 4075623 (1978-02-01), Futagawa et al.

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