Variable gain control circuit

Details Variable gain control circuit Variable gain control circuit

1983-02-08

1985-02-12

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330285, H03F 345, H03G 310

Patent

active

044994290

ABSTRACT:
A variable gain control circuit comprises first, second, third and fourth transistors each having an emitter, a base and a collector. The bases of the first and second transistors are connected to receive a control signal. The collector of the first transistor is connected to a first reference power source through a resistor. An output is generated from the node of the collector of the first transistor and the resistor. The collector of the second transistor is connected to the first reference power source, too. The emitter of the first transistor is connected to the base of the third transistor and the collector of the fourth transistor. The emitter of the second transistor is connected to the collector of the third transistor, and the base of the fourth transistor. It further comprises a first PN junction forwardly connected in series to the base-emitter junction of the third transistor, a second PN junction forwardly connected in series to the base-emitter junction of the fourth transistor, and an input signal supplying means connected between the first and second PN junctions on one hand and a second reference power source on the other hand.

REFERENCES:
patent: 3512096 (1970-05-01), Nagata et al.
patent: 3581222 (1971-05-01), Dunwoodie
patent: 4340866 (1982-07-01), Metz
Blauschild, "An Open Loop Programmable Amplifier with Extended Frequency Range," IEEE Journal of Solid-State Circuits, vol. SC-16, No. 6, pp. 626-633, Dec. 1981.
Blauschild, "An Open-Loop Programmable Amplifier with a Maximum Gate-Bandwidth Product of 1GHz," IEEE International Solid-State Circuits Conference, vol. 24, pp. 190, 191, 272, 2/81.

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