Cascode amplifier is a two stage circuit consisting of a transconductance amplifier followed by a buffer amplifier. The word cascode was originated from the phrase cascade to cathode. This circuit have a lot of advantages over the single stage amplifier like, better input output isolation, better gain, improved bandwidth, higher input impedance, higher output impedance, better stability, higher slew rate etc. The reason behind the increase in bandwidth is the reduction of Miller effect. Cascode amplifier is generally constructed using FET ( field effect transistor) or BJT ( bipolar junction transistor). One stage will be usually wired in common sourcecommon emitter mode and the other stage will be wired in common base common emitter mode.
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