Variable gain control circuit

Details Variable gain control circuit Variable gain control circuit

1979-05-11

1981-11-10

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330260, H03F 345, H03G 300

Patent

active

043001025

ABSTRACT:
The emitters of a pair of transistors are connected to each other. A voltage/current converter circuit for converting an AC voltage into an AC current is inserted between ground and the junction point of said emitters, thus making up a first differential amplifier. With an input signal applied to the voltage/current converter circuit, an output signal is produced from one of the transistors of the first differential amplifier. With a fixed bias voltage applied to the other transistor of the first differential amplifier, the bias voltage for said one of said transistors is changed, thus controlling the amplitude of the output signal. A second differential amplifier has first and second input terminals. The first input terminal thereof is supplied with an output signal of said one of the transistors, and the second input terminal thereof with the output signal of the other transistor, thereby producing a second output signal proportional to the difference between the output voltages of the one and other transistors. This second output signal is fed back to said one of the transistors, thus reducing the distortion of the output signal of said one of the transistors.

REFERENCES:
patent: T886006 (1971-05-01), Nichols
patent: 3452289 (1969-06-01), Ryan

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