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Primary Examiner: Mullins, James B.
Assistant Examiner:
Attorney: Christoffersen; H., Cohen; S., Limberg; A. L.

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Title: Controlled gain amplifier

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.

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Inventors: Hall, James Robert (Canoga Park, CA, US)

Application Number: 520792
Filing Date: 1974-11-04
Publication_date: 1976-03-02
Assignee: RCA Corporation (New York, NY)
Primary Class(es): 330/285 330/288
Other Classes:
US Patent Ref:

3828266

Aug, 1974

Okada et al.

330/29.

Other Refs: Other References: Widlar, "Design Techniques for Linear Integrated Circuits," Electronic Communicator, Nov./Dec. 1966, pp. 7, 8.