Answered: In a non-inverting amplifier if the…

In a non-inverting amplifier if the feedback resistor is equal to the input resistor, we produce a voltage follower a unity gain amplifier a voltage tripler a voltage doubler

Physics for Scientists and Engineers, Technology Update (No access codes included)

9th Edition

ISBN:9781305116399

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter33: Alternating Current Circuits

Section: Chapter Questions

Problem 33.7P: An audio amplifier, represented by the AC I source and resistor in Figure P33.7, delivers to the...

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Question

In a non-inverting amplifier if the feedback resistor is equal to the input resistor, we produce
a voltage follower
a unity gain amplifier
a voltage tripler
a voltage doubler

Expert Solution

Step 1

The voltage gain of a non-inverting amplifier is :

$V o l t a g e g a i n = \frac{V_{o u t}}{V_{i n}} = 1 + \frac{R_{f}}{R_{i}}$

It is given as $R_{f} = R_{i}$ .

Step 2

We get,

$\frac{V_{o u t}}{V_{i n}} = 1 + 1 = 2$

$V_{o u t} = 2 V_{i n}$

This shows that the output voltage is twice of input voltage that is the work of a voltage doubler.

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