Question

Question 20)

A certain noninverting amplifier has Ri of 2 kΩ and Rf of 200 kΩ. The closed-loop voltage gain is ………


Options:

101

200

100,000


202​

Answer 1

The closed-loop voltage gain is 101.

Given:

A certain noninverting amplifier has Ri of 2 kΩ and Rf of 200 kΩ.

To Find:

The closed-loop voltage gain

Solution:

Ri = 2 kΩ

Rf = 200 kΩ

According to the formula

The closed-loop voltage gain Acl = $(1 + \frac{Rf}{Ri} )$

Putting the values in the formula

Acl = $(1 + \frac{200}{2} )$

Acl = $(1 + 100 )$

Acl = 101

Therefore, the closed-loop voltage gain is 101.

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Answer 2

Answer:

The closed-loop voltage gain is 101.

Explanation:

Given a noninverting amplifier.

In non-inverting operational amplifier, feedback control is achieved by giving a small part of the output voltage to the inverting input terminal through the voltage divider network, thus producing negative feedback again.

This is referred to as closed-loop configuration that gives a very good stability to the non-inverting amplifier circuit.

The resistances of resistors in voltage divider network,

$R_i = 2 k\Omega$ and $R_f = 200 k\Omega$

The closed-loop voltage gain of a non-inverting amplifier circuit is given by

$A_V=1+\dfrac{R_f}{R_i}$

     $=1+\dfrac{200}{2} =1+100=101$

Therefore, the closed-loop voltage gain is 101.

So, the correct answer is option a.

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