First slide

Transistors

Question

A common emitter transfer amplifier has a current gain of 25. If the load resistance is 3kΩ and input resistance is 750Ω, the voltage gain of the amplifier is

Moderate

Solution

Given : $C u r r e n t g a i n = β = 25$
$l o a d r e s i s \tan c e = R_{L} = 750 Ω$
$I n p u t r e s i s \tan c e = R_{i} = 3000 Ω$
Voltage gain : $A_{v} = β \frac{R_{L}}{R_{1}}$
$= 25 \times \frac{3000}{750} = 100 = 0100.00$

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