| 摘要 |
A wide bandwidth, low power dissipation, cascode video output amplifier suitable for driving an in-line gun color picture tube or the like. The cascode amplifier includes a low voltage, small signal, common emitter amplifier transistor and a high voltage common base transistor. An active load circuit comprising a transistor of like conductivity with respect to the common base and common emitter transistors is coupled between the collector of the common base stage and a source of operating voltage. A disconnect diode, interposed between the emitter of the load transistor and the collector of the common base transistor, is based to a non-conductive state under quiescent conditions. Voltage dependent current feedback is provided from the emitter of the load transistor to the base of the common emitter transistor. Operating current for the cascode arrangement is provided via a resistor coupled from the operating voltage source to the base of the load transistor and the collector of the common base transistor.
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