Answered: (c ) The overall gain of a multistage…

(c ) The overall gain of a multistage amplifier is 140. When the negative feedback is applied , the gain is reduced to 17.5. Find the fraction of the output that is feedback to the input.

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

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Concept explainers

Multistage Amplifier

The multistage amplifier is generally a voltage or power amplifier. The multistage amplifier has a number of single stage amplifier that are cascaded together. Since a single stage amplifier output is not useful, they are being replaced with multistage amplifiers or multistage transistor amplifiers. The multistage amplifier are used where the gain required is high or the input signal is very small such that only a single stage amplifier cannot amplify it.

Question

(c ) The overall gain of a multistage amplifier is 140. When the negative
feedback is applied , the gain is reduced to 17.5. Find the fraction of the output
that is feedback to the input.

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FACTS:An amplifier, electronic amplifier or amp is an electronic device that can increase the power of a signal. Classification of the amplifier can be done in 3 different ways. Voltage amplifiers. Current amplifiers. Power amplifiers. QUESTION: You've learned in Module 1 that an Amplifier's Output can be positive or negative which is just natural since we're already dealing with AC signals. But, why do we use negative feedback in Amplifiers?