Question

A differential amplifier is to have a voltage gain of 100. What will be the feedback resistance required if the input resistances are both 1 kΩ?

Answer 1

required feedback resistance ( R2 ) = 100 k Ω

Step-by-step explanation:

Given data :

Voltage gain = 100

input resistance ( R1 ) = 1 k ohms

calculate feedback resistance required

voltage gain of differential amplifier

`(Vout)/(V2 - V1 ) = (R2)/(R1)`

= Voltage gain = R2/R1

= 100 = R2/1

hence required feedback resistance ( R2 ) = 100 k Ω