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Old 23rd December 2005, 01:06 PM   #1
Antonix is offline Antonix  Italy
diyAudio Member
Join Date: Apr 2005
Location: BA
Default Orcad & tube library

I have added a library of Tubes to Orcad 10.3.
I have runned simulation of a my circuit that contain a part of tube library
and I have error undefined subcircuit.

I have added the library as global and now I have errors of node floating.

How i can do ?
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Old 23rd December 2005, 06:37 PM   #2
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Join Date: May 2005
Location: Dallas (but I am not a Texan!)
Hi -

"Floating nodes" means that there are nodes with no DC reference to ground, or no connection. You need to add some reference - like a 1000 megohm resistor - to placate the simulator. Or, the subcircuit names aren't matched up with the symbol names so they are unconnected.

This might also be helpful (especially with undefined subcircuits, I always have issues with associating the models and pins correctly) if you haven't looked at it:


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Old 26th December 2005, 01:49 PM   #3
Antonix is offline Antonix  Italy
diyAudio Member
Join Date: Apr 2005
Location: BA

I have solved the problem placing a 0 volt ground to circuit.
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Old 26th December 2005, 01:54 PM   #4
Antonix is offline Antonix  Italy
diyAudio Member
Join Date: Apr 2005
Location: BA
Just a question on measures with Orcad.

I have to test the frequency response of a preampli circuit.
I have set AC VIN 1V and I have create a new simulation profile with AC Speep from 0.01Hz to 1Meg.

It's correct?

How can i measure the THD distortion?

I know that I create a Transient simulation centered to 1khz.
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