Common Collector Amplifier-Emitter Follower

Part 2:
Common Collector Amplifier Example
Common Collector Amplifier is also known as emitter-follower. Since the output voltages are in phase with the input signal and the magnitude is almost same as the input. Common Collector amplifier has the characteristics of high input resistance and it provides unity voltage gain approximately (AV=1). It only provides the current gain which is the ratio of output current (Ie) and the input current (Ib).  The term common collector is used since the collector terminal is at ac ground since we replace all the voltage sources with ground while performing the ac analysis.

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