Television – Image signal processing circuitry specific to television – Amplifiers
Patent
1993-04-15
1994-12-20
Powell, Mark R.
Television
Image signal processing circuitry specific to television
Amplifiers
330 98, 330104, 330124R, 330293, H04N 514
Patent
active
053749669
ABSTRACT:
A video amplifier having a reduced noise figure is realized by eliminating the need for a resistive matching termination at the input of the amplifier. A negative feedback loop reduces the effective input impedance of the amplifier by generating an active impedance at the input of the amplifier. Because the input impedance of the amplifier is actively matched to the output impedance of the video signal generator, a noise-generating resistive termination is unnecessary, and the noise figure of the overall impedance-matched amplifier is significantly reduced.
REFERENCES:
patent: 3299367 (1967-01-01), Howden
patent: 3538445 (1970-11-01), Brennen
patent: 3713031 (1973-01-01), Williams et al.
patent: 4091333 (1978-05-01), Thrap
patent: 4292468 (1981-09-01), Yokoyama
patent: 4577160 (1986-03-01), Lettvin et al.
patent: 4786878 (1988-11-01), Botti
patent: 5227735 (1993-07-01), Lumsden
Miller John W.
Powell Mark R.
Westinghouse Electric Corporation
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