Answered: O +15 V Vo V1 6 -15 V 39 k2 1 k2

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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Question

What are the voltages V_O and V_ID in the op amp circuit shown for dc input voltages of (a) V_I = 300 mV and (b) V_I = 600 mV if the 1-kΩ resistor is replaced by a 910-Ω resistor.

Expert Solution

Step 1

According to the information given the diagram can be modified as

Case a :

As the voltage at noninverting terminal is 300 mV then due to the virtual ground concept the voltage at the inverting terminal is also 300 mV.

Thus the voltage at point A is 300 mV.

An ideal op-amp the current through inverting and noninverting terminal is zero thus the current I is given as

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