D.C. Gain controlled amplifier

Details D.C. Gain controlled amplifier D.C. Gain controlled amplifier

1978-05-11

1980-04-15

Murray, Richard

Facsimile and static presentation processing

Static presentation processing

Attribute control

330285, 329 50, H04N 9535

Patent

active

041986520

ABSTRACT:
A D.C. gain controlled differential amplifier exhibiting balanced operation and a linear gain control response. The amplifier includes input and output emitter coupled transistors and a current source transistor. Input signals are supplied to the base of the input transistor, and a negative feedback network is D.C. coupled from the collector to base of the output transistor. A D.C. gain control voltage varies the conduction of the current source transistor to thereby vary the gain of the emitter coupled transistors. The control voltage is also D.C. coupled to a collector signal output of the output transistor to maintain the output quiescent level substantially constant as the amplifier is gain controlled.

REFERENCES:
patent: 3651418 (1972-03-01), Wittmann
patent: 3764931 (1973-10-01), Waku et al.
"CA3144G TV Luminance Processor", RCA Corp. Solid State Division, Somerville, N.J., 6-76.

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