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What is difference between cascade and cascode amplifier?
What about the input and output impedance?
The input impedance of a cascode amplifier is high because of the common-base configuration of the first stage. The output impedance is low because of the common-emitter configuration of the second stage. The input impedance of a cascade amplifier depends on the configuration of each stage, but in general, it is lower than that of a cascode amplifier. The output impedance is higher than that of a cascode amplifier.