Gain controlled amplifier circuit

Details Gain controlled amplifier circuit Gain controlled amplifier circuit

1989-08-07

1991-01-22

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330257, H03F 345, H03G 330

Patent

active

049873806

ABSTRACT:
A gain controlled amplifier circuit includes a prior stage amplifier circuit (22) for amplifying an input signal, differentially connected first and second transistors (28, 29), and a current source transistor (27) connected to a common emitter of the first and the second transistors. An output current of the prior stage amplifier circuit is provided to the current source transistor, and a control signal is provided between bases of the first and the second transistors. A collector current of the second transistor is provided from an output terminal (31) as an output current, while a collector current of the first transistor is negatively fed back to the prior stage amplifier circuit through a negative feedback path (30).

REFERENCES:
patent: 4379995 (1983-04-01), Yamada et al.
patent: 4516081 (1985-05-01), Katakura
"Nikkei Electronics", issued Jun. 27, 1988; pp. 88-89.

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