High frequency wide bandwith video amplifier with high tracking

Details High frequency wide bandwith video amplifier with high tracking High frequency wide bandwith video amplifier with high tracking

1985-04-16

1987-03-31

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 65, 358190, H04N 516

Patent

active

046547126

ABSTRACT:
A wide bandwith video amplifier circuit with a high output DC voltage bias and which is capable of high tracking linearity. The video amplifier circuit comprises an AC pre-amplifier, a DC restorer amplifier stage and a DC output stage. The DC restorer amplifier stage and the output stage operate from a first DC power supply which is floating such that the output stage can be biased at a desired D.C. voltage, relative to a floating ground. A first power supply is used to provide the necessary power to the amplifier circuits, DC restorer amplifier and the output stage. A second power supply provides a DC bias voltage to the output stage and DC restorer stage which is additive to the DC level of the amplifier circuit set within a floating DC power supply. This DC bias voltage can be altered relative to a true 0 volt ground level, thus allowing the setting of the DC bias of the output stage at a required level relative to the true ground potential.

REFERENCES:
patent: 3383615 (1968-05-01), Milberger et al.
patent: 3955047 (1976-05-01), Willis
patent: 4229706 (1980-10-01), Bongiorno
patent: 4323923 (1982-04-01), Reneau
patent: 4401954 (1983-08-01), Suzuki
patent: 4560946 (1985-12-01), Yokoyama
patent: 4598255 (1986-07-01), Hong

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