Gain control circuits utilizing a novel semiconductor device

Details Gain control circuits utilizing a novel semiconductor device Gain control circuits utilizing a novel semiconductor device

1975-03-26

1976-08-24

Mullins, James B.

Amplifiers

Signal feedback

Combined with control of bias voltage of signal amplifier

330 30D, 357 34, 357 39, H03G 330

Patent

active

039769518

ABSTRACT:
A gain control circuit of the multistage differential amplifier type comprising a first pair of transistors forming a first differential amplifier supplied with an input signal, a second pair of transistors forming a second differential amplifier connected to amplify further the output of the first differential amplifier and a novel semiconductor device of the three-terminal type connected in common between the respective outputs of both the first pair of transistors and an operating voltage source, in which the gain control is attained by controlling the value of the current flowing through at least one differential amplifier. The novel semiconductor device has a semiconductive body similar to an ordinary transistor and acts as a bidirectionally conductive element with a superior symmetrical characteristic.

REFERENCES:
patent: 3710270 (1973-01-01), Addis et al.

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