Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1977-01-21
1978-10-03
Martin, John C.
Facsimile and static presentation processing
Static presentation processing
Attribute control
358 40, 358184, 358242, 330265, H04N 918, H04N 568, H04N 514, H03K 500
Patent
active
041187318
ABSTRACT:
A wide bandwidth video amplifier suitable for driving a kinescope of a television receiver exhibits suppressed radio frequency (RF) harmonic radiation. The amplifier includes a transistor having a nonlinear conduction characteristic in a region of low current conduction. An input circuit including a source of video signals is coupled to a base electrode of the transistor, and output signals are provided from a collector output circuit of the transistor. Degenerative direct current feedback is provided from the output circuit to the input circuit. Undesired RF harmonics produced by dynamic operation of the transistor in a region of low current conduction is suppressed in a first instance by a nonlinear conduction device (e.g., a forward biased diode) arranged to provide degenerative emitter feedback for the transistor during low current conduction. Harmonic radiation is suppressed in a second instance by a low pass filter interposed between the input circuit and the base electrode of the transistor.
REFERENCES:
patent: 2892165 (1959-06-01), Lindsay
patent: 3090926 (1963-05-01), Engel
patent: 3105198 (1963-09-01), Higginbotham
patent: 3519946 (1970-07-01), Camezind
patent: 4035840 (1977-07-01), Teuling
Kurdyla Ronald H.
Martin John C.
Meagher William H.
RCA Corporation
Whitacre Eugene M.
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