Answer to Question #136491 in Electrical Engineering for Rakibul

Question #136491

Show that the voltage gain of Emitter Follower is less than unity.


1
Expert's answer
2020-10-05T09:48:00-0400

Voltage gain is


"A_v=V_0\/V_{in}"

If we look at the emitter follower circuit, according to Kirchhoff's voltage law we can write:


"V_{in}-V_{be}=V_0"

Substitute and get:


"A_v=\\frac{V_{in}-V_{be}}{V_{in}}<1."

But why is that? Because for semiconductors,

"V_{be}=(0.3...0.7)\\text{ V}."



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