Amplifier circuit having controllable gain

Details Amplifier circuit having controllable gain Amplifier circuit having controllable gain

1979-10-01

1981-12-08

Willis, Davis L.

Amplifiers

With semiconductor amplifying device

Including gain control means

330285, H03G 318, H03G 330

Patent

active

043050441

ABSTRACT:
An amplifier circuit, having voltage gain responsive to a control signal, includes a transistor stage having a transistor and a load, and an amplifier stage in cascade connection, and a control transistor connected to the transistor. The control signal varies the collector current of the transistor via the control transistor whereby the voltage gain of the transistor stage correspondingly varies. Degenerative feedback couples the output to the input for stabilizing the quiescent output potential so that the amplifier circuit is susceptible of being direct coupled to subsequent circuits.

REFERENCES:
patent: 3365673 (1968-01-01), Barditch et al.
patent: 3430155 (1969-02-01), Harwood
patent: 3491306 (1970-01-01), Nielsen
patent: 3651420 (1972-03-01), Giontzeneli
patent: 3691465 (1972-09-01), McFadyen
patent: 3942129 (1976-03-01), Hall
patent: 3970949 (1976-07-01), Higuchi
Camenzind et al., "An Outline of Design Techniques for Linear Integrated Circuits", IEEE Journal of Solid State Circuits, vol. SC-4, No. 3, Jun. 1969, pp. 110-121.

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