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#1 Jan 10, 2017
Atousa
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Encountering with loop error in PSpice

Hi
I encountered with following error in simulating the circuit shown below in PSpice. 

ERROR -- Voltage source and/or inductor loop involving E_U2
You may break the loop by adding a series resistance

Could any one help me please?

http://uupload.ir/files/8xbv_opamp1.png

Tue, 2017-01-10 03:23
RobertoGb
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Hello,

This error is related to bias point calculation. When the simulator has DC nodes isolated from ground, this error can pop up. The solution is to place very small resistors in serie (10m for example). In your case, you need to place resistors at the output of U2, U4 and U5 and after V3.

I hope it helps.

 

 

Tue, 2017-01-10 03:56 (Reply to #2)
Atousa
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Thanks for your concern.

i did what you said but the problem still remains :(

http://uupload.ir/view/dggk_opamp1.png

 

Tue, 2017-01-10 04:04 (Reply to #3)
Atousa
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the problem resists :|

http://uupload.ir/files/8yzm_opamp1.png

ERROR -- Voltage source and/or inductor loop involving E_U2
You may break the loop by adding a series resistance

Tue, 2017-01-10 04:32
RobertoGb
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You also need to place a resistor after V5. It should work. Let me know

Tue, 2017-01-10 05:20 (Reply to #5)
Atousa
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Thanks but:

ERROR -- Voltage source and/or inductor loop involving E_U4
You may break the loop by adding a series resistance

http://uupload.ir/files/k50b_untitled.png

:(

Tue, 2017-01-10 05:25
RobertoGb
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Well, then it could be that the resistors are not well connected. It is working at my end. Could you send me the design to pspice@flowcad.de so that I can debug the problem?

Thanks

Tue, 2017-01-10 05:28 (Reply to #7)
Atousa
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Of couse! I'm so grateful

Wed, 2017-01-11 03:51 (Reply to #8)
Atousa
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Dear Roberto,
Thank you so much for your time and help. My problem was solved and it is working now. :) 

Best regards

Atousa

Fri, 2017-01-20 03:32 (Reply to #9)
Atousa
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Dear Roberto,

I have another problem with my circuit.

I would be really grateful if you could tell me why two of these voltage generators (V1 and V2) show negative values whereas the specified values for all of them via text files are positive.

Regards

Atousa

http://uupload.ir/filelink/Qd1ZhCoodloW/qx10_schematic1_page1.pdf

http://uupload.ir/files/xar6_output.png

 

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