H - Electricity – 03 – F
Patent
H - Electricity
03
F
330/35, 350/73
H03F 1/34 (2006.01) H04N 9/00 (2006.01)
Patent
CA 1123066
Abstract of the Invention A wide bandwidth video amplifier suitable for driving a kinescope of a television receiver exhibits sup- pressed radio frequency (RF) harmonic radiation. The amplifier includes a transistor having a nonlinear conduction characteristic in a region of low current cc duction. An input circuit including a source of video signals id 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 inter- posed between the input circuit and the base electrode of the transistor.
282302
Morneau Roland L.
Rca Corporation
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