Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1976-09-27
1978-04-04
Martin, John C.
Facsimile and static presentation processing
Facsimile
Recording apparatus
358184, 358 65, H04N 568, H04N 918
Patent
active
040829960
ABSTRACT:
A video amplifier suitable for providing amplified image-representative signals to an image reproducing device having a capacitive input impedance component comprises a first wideband amplifier stage which provides video signal voltage gain substantially greater than unity.
A second wideband amplifier stage provides approximately unity video signal voltage gain and includes at least one amplifying device having input, output and common terminals. An output load circuit comprising at least first and second resistors is coupled in series relation between the output and common terminals through the power supply. Direct coupling means are provided for supplying amplified video signals from the output terminal to the image reproducing device. Amplified signals are capacitively coupled from the first stage to the input terminal of the second stage.
A further capacitor is coupled from the input terminal of the second stage to a junction between the first and second resistors of the output load so as to couple video signal excursions of a polarity tending to reduce conduction of the amplifying device to the output terminal and the load.
REFERENCES:
patent: 2819334 (1958-01-01), Squires
patent: 3803503 (1974-04-01), Greutman
Martin John C.
Meagher William H.
RCA Corporation
Schaefer Kenneth R.
Whitacre Eugene M.
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