Answer to Question #109526 in Electrical Engineering for Bharti

Question #109526
Show that the voltage gain of an emitter follower circuit is close to unity.
1
Expert's answer
2020-04-19T07:39:41-0400

An emitter follower circuit and its equivalent are shown below:



The voltage gain is


"A=\\frac{(\\beta+1)[R_ER_L\/(R_E+R_L)]}{(R_s+r_{bc})+(\\beta+1)[R_ER_L\/(R_E+R_L)]}."

The term "(R_s+r_{bc})<<(\\beta+1)[R_ER_L\/(R_E+R_L)]." Therefore, the voltage gain is positive, close to unity but it is smaller than unity.


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