Controlled gain amplifier

Details Controlled gain amplifier Controlled gain amplifier

1974-11-04

1976-03-02

Mullins, James B.

Amplifiers

Signal feedback

Combined with control of bias voltage of signal amplifier

330 38M, 330 40, H03G 330

Patent

active

039421295

ABSTRACT:
A common-emitter amplifier transistor has its gain controlled by change of its transconductance as a function of its quiescent emitter current. A first controlled current applied to a diode means develops a potential thereacross which is applied between the base and emitter electrodes of the amplifier transistor. This configuration causes the quiescent collector and emitter currents of the amplifier transistor to be in well-defined proportion to the first controlled current. This permits a second controlled current linearly related to the first to be used to counteract changes in the quiescent collector current of the common-base amplifier transistor, insofar as being coupled to the amplifier load.

REFERENCES:
patent: 3828266 (1974-08-01), Okada et al.
Widlar, "Design Techniques for Linear Integrated Circuits," Electronic Communicator, Nov./Dec. 1966, pp. 7, 8.

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