Broadband, high speed video amplifier

Amplifiers – With semiconductor amplifying device – Including plural stages cascaded

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Details

307268, 358184, H03F 368

Patent

active

047587997

ABSTRACT:
A broadband, high speed, signal inverting video amplifier comprises a generally conventional, main cascode amplifier and first and second current boosting cascode amplifiers means which are capacitively coupled to the main cascode amplifier. The first current boosting amplifier provides a positive current spike in response to an input video signal abruptly decreasing, the positive current spike provided thereby being fed into the main cascode amplifier in a manner causing the current spike to be added to current through the main amplifier when the amplified video signal goes positive. The second current boosting amplifier provides a negative current spike in response to the input video signal abruptly increasing, the negative current spike provided thereby being fed into the main cascode amplifier in a manner causing the such current spike to be substracted from the current through the main amplifier when the amplified video signal goes negative. The positive and negative spikes cause the amplified output video signal to have rise and fall times to be less than about 3.5 nanoseconds at loads of at least about 25 pf at peak-to-peak output voltages of at least about 40 volts and to be no more than about 1.8 nanoseconds at about 20 volts peak-to-peak for a load of about 14.5 pf.

REFERENCES:
patent: 3573402 (1971-04-01), Chambers, Jr.
patent: 4118731 (1978-10-01), Hinn
patent: 4419593 (1983-12-01), Butler et al.

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