Answered: The feedback amplifier in Figure 1 has…

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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The feedback amplifier in Figure 1 has Rs = 20kΩ, R1 = 10kΩ, R2 = 100kΩ, R3 = 100kΩ and RL = 10kΩ. It
uses an operational amplifier with the following parameters:
• Open-loop gain a = 100,000 V/V
• Input resistance ri = 200kΩ
• Output resistance ro = 100Ω

Find the following closed-loop parameters of the circuit, taking into account the loading effects of the source
resistance, the load resistance and the feedback network:
(a) Feedback factor ƒ
(b) Voltage gain Avƒ = vL /vs
(c) Input resistance Rinƒ
(d) Output resistance Routƒ

Rs
Vs
www
R3
www
R₂
Figure 1 Feedback amplifier.
RL
R1

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