Calculate the gain of an amplifier in which the collector resistance Rc is 5 kilo Ohm. The input resistance between the base and emitter of a typical transistor is 2.5 kilo Ohm and the value of its β = 100. Answer (250) 



Given:

Collector Resistance = `\R_C` =  5 kΩ = 5ｘ10³ Ω

Base-Emitter Resistance = `\r_{ie}` =  2.5 kΩ = 2.5ｘ10³ Ω

Current Gain = β = 100


To Find:

Voltage gain = A = ?



Solution:


The Voltage Gain A can be calculated by a formula


A = - Î²`\frac {R_C}{r_{ie}}` 

putting values

A = - 100 ï½˜ `\frac {5ｘ10³ Ω}{2.5ｘ10³ Ω}`

A = - 100 ï½˜ 2

A = - 200 ---------------Ans.

The -ve sign shows that input and output are out of phase at an angle of 180°.



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