Cascode

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.

  1. ^ Phillip A. Laplante (2005). Comprehensive Dictionary of Electrical Engineering (Second ed.). Boca Raton: CRC Press. p. 97. ISBN 0-8493-3086-6.
  2. ^ S. W. Amos; Roger S. Amos (2002). Newnes Dictionary of Electronics (Fourth ed.). Oxford: Newnes. pp. 46. ISBN 0-7506-4331-5.