?
Solved

pspice error

Posted on 2010-04-02
11
Medium Priority
?
4,312 Views
Last Modified: 2012-08-14
I always get the following error when trying to do a bias point simulation

ERROR -- Voltage source and/or inductor loop involving X_F1.VF_F1
You may break the loop by adding a series resistance  


the circuit is below... why is that?

pspice.JPG
thevenin.JPG
0
Comment
Question by:kuntilanak
  • 6
  • 5
11 Comments
 
LVL 27

Expert Comment

by:d-glitch
ID: 29465629
I'm not sure how you dependent sources work, but I think the sense current
should actually flow through the input sense termingal.

You might try deleting the short wire above the V3 source.

The wire should go from the left side of R6 to the top input of F1,
then from the bottom input of F1 to the top of V3.

The gain of F1 should be beta, probably somewhere between 50 and 100.
0
 

Author Comment

by:kuntilanak
ID: 29466537
does this circuit seems to be right
cap.JPG
0
 
LVL 27

Expert Comment

by:d-glitch
ID: 29466785
No.  My mistake.

>>  The wire should go from the RIGHT side of R6 to the top input of F1,
       then from the bottom input of F1 to the top of V3.
0
Evaluating UTMs? Here's what you need to know!

Evaluating a UTM appliance and vendor can prove to be an overwhelming exercise.  How can you make sure that you're getting the security that your organization needs without breaking the bank? Check out our UTM Buyer's Guide for more information on what you should be looking for!

 

Author Comment

by:kuntilanak
ID: 29466948
what is the difference between that and my original circuit?
0
 
LVL 27

Expert Comment

by:d-glitch
ID: 29467039
On second look, you values are correct.

That is the way to connect the dependent source.
I am not familiar with this version of PSpice.
0
 

Author Comment

by:kuntilanak
ID: 29467111
so what I am doing is correct on the first one, it just that you don't know what's wrong ?
0
 
LVL 27

Accepted Solution

by:
d-glitch earned 2000 total points
ID: 29468179
In the first one, you are trying to look at the current in a short circuit (just a piece of wire).
You could  have put a 1 ohm (or 1 milliohm) resistor there, and things would have worked out.

This is what I meant by my fist post.  Treating the input to the dependent source like a current meter.

But you last circuit seems to be correct.
pspice-1A.JPG
0
 

Author Comment

by:kuntilanak
ID: 29468842
oh...that's what you mean... so here is what I got doing the simulation with what you have there

what does it mean when they say to:

short a-b and run a BIAS POINT simulation to find the short-ckt current iSC

what does short a-b mean
cap.JPG
0
 
LVL 27

Expert Comment

by:d-glitch
ID: 29470610
My circuit is not correct.  

Your last circuit (with 307 uA for IB) is the way to go.

Look back up to the second picture in this post to see where (a) and (b) are.

To short out a and b, means to connect a  V=0 voltage source or a small resistor (1 ohm or 1 milliohm)
between these points and see what the current is.

You may have noticed that one of your questions from yesterday was deleted because the moderators
thought I was giving you too much help.  I don't think they read the question that closely.
But that's the way it goes.
0
 

Author Comment

by:kuntilanak
ID: 29471003
so the circuit here:

ID: 29466537

is the correct one?

just clarifying
0
 
LVL 27

Expert Comment

by:d-glitch
ID: 29471099
Yes.  That looks correct.
0

Featured Post

SMB Security Just Got a Layer Stronger

WatchGuard acquires Percipient Networks to extend protection to the DNS layer, further increasing the value of Total Security Suite.  Learn more about what this means for you and how you can improve your security with WatchGuard today!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

This article covers the basics of data encryption, what it is, how it works, and why it's important. If you've ever wondered what goes on when you "encrypt" data, you can look here to build a good foundation for your personal learning.
Aerodynamic noise is the cause of the majority of the noise produced by helicopters. The inordinate amount of noise helicopters produce is a major problem in the both a military and civilian setting. To remedy this problem the use of an aerogel coat…
Although Jacob Bernoulli (1654-1705) has been credited as the creator of "Binomial Distribution Table", Gottfried Leibniz (1646-1716) did his dissertation on the subject in 1666; Leibniz you may recall is the co-inventor of "Calculus" and beat Isaac…
I've attached the XLSM Excel spreadsheet I used in the video and also text files containing the macros used below. https://filedb.experts-exchange.com/incoming/2017/03_w12/1151775/Permutations.txt https://filedb.experts-exchange.com/incoming/201…
Suggested Courses

593 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question