Cascode
Two-stage amplifier in an electronic circuit / From Wikipedia, the free encyclopedia
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Not to be confused with Cascade (disambiguation).
The cascode is a two-stage amplifier that consists of a common emitter stage feeding into a common base stage when using bipolar junction transistors (BJTs)[1][2] or alternatively a common source stage feeding a common gate stage when using field-effect transistors (FETs).
Because there is no direct coupling from the output to input, the Miller effect is eliminated, contributing to a much higher bandwidth. Compared to a single amplifier stage, this combination may have one or more of the following characteristics: higher input–output isolation, higher input impedance, high output impedance, higher bandwidth.