Engineering Analyzing this operational amplifier circuit with DC

[ZoeDale]

Homework Statement

a) Treat the operational amplifier in the circuit below as ideal and solve for Vo.
b) Treat the op amp as a non-ideal device that is powered by VCC and VEE; describe several ways in which your answer in part a) will change.

Relevant Equations

KVL; KCL;

Hi all, I attached my attempt at a solution in the attached picture. I am using the textbook titiled as ”electronic circuit analysis“ by David E. Johnson, and op amp is in chap 3;
while I did not find any example that attach the Vee and Vcc with amplifier . It seems that v+ = v- doesn’t hold in this scenario; can anybody give me some hints?

thanks!

 

[ZoeDale]

 

[berkeman]

Um, that circuit has a fundamental problem, and is non-physical. SPICE, for example, would throw an error if you tried to analyze it. Are you sure this came from a textbook?

 

[ZoeDale]

this is a problem from our qualify exam samples for practice. No solutions provided.

 

[berkeman]

this is a problem from our qualify exam samples TAT for practice. No solutions provided.

Well, that circuit is complete nonsense as drawn, so there is no solution to the problem. Maybe that is the test of the problem -- you are supposed to reply that the circuit is nonsense in order to get credit.

Can you say what is totally wrong about that circuit?

 

[ZoeDale]

Um, that circuit has a fundamental problem, and is non-physical. SPICE, for example, would throw an error if you tried to analyze it. Are you sure this came from a textbook?

Seems that v+ can not be equal to v- in the ideal condition; or the non-ideal condition. But I can not figure out what will happen in the circuit; Can you give more hints on that? Thank you!

 

[berkeman]

Can you give more hints on that?

Opamp inputs must have some DC bias connection to somewhere to supply their input bias currents and to set the DC operating point. Do you see the issue now?

 

[ZoeDale]

Opamp inputs must have some DC bias connection to somewhere to supply their input bias currents and to set the DC operating point. Do you see the issue now?

oh, you mean they should be on each side of the lying triangle's waist, separately?

 

[berkeman]

oh, you mean they should be on each side of the lying triangle's waist, separately?

Sorry, I don't understand your response.