Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1974-09-09
1976-07-20
Wilbur, Maynard R.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
315383, 315386, H01J 2952
Patent
active
039708950
ABSTRACT:
An amplifier for driving a color image reproducing device includes a first transistor the base of which is capacitively coupled to a source of color difference signals. The emitter of the first transistor is direct current coupled to the base of a second transistor. The collector of the second transistor is direct current coupled to the base of the first transistor. The emitter of the second transistor is coupled to a source of a predetermined voltage. The emitter of the first transistor is direct current coupled to the emitter of a third transistor of opposite conductivity type which serves as a luminance signal amplifier. The first and third transistors form a matrix amplifier operative to generate a color signal at the collector of the first transistor. The capacitive coupling device and the second transistor form a clamping circuit for maintaining the voltage developed at the emitter of the first transistor substantially independent of direct current conditions of the source of color difference signals and base-to-emitter voltage variations of the first transistor.
REFERENCES:
patent: 3311900 (1967-03-01), Gaunt, Jr.
patent: 3436563 (1969-04-01), Regitz
patent: 3644669 (1972-02-01), Slavik
patent: 3780317 (1973-12-01), Kurata et al.
Buczinski S. C.
Emanuel Peter M.
RCA Corporation
Whitacre Eugene M.
Wilbur Maynard R.
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