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Bipolar Junction Transistors (BJT) - Technical MCQs

Q1:

The input resistance of the base of an emitter-follower is usually _________.

A very low

B very high

C shorted to ground

D open

ANS:B - very high

Common collector is also called Emitter follower.

So common collector has high input resistance and low output resistance. This is used for Impedance matching.