Orcad & tube library

Antonix · 23rd December 2005, 02:06 PM

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 ?

pmillett · 23rd December 2005, 07:37 PM

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:

http://www.duncanamps.com/technical/pspicetubes.html

Pete

Antonix · 26th December 2005, 02:49 PM

OK.

I have solved the problem placing a 0 volt ground to circuit.

Antonix · 26th December 2005, 02:54 PM

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.

23rd December 2005, 02:06 PM	#1
Antonix diyAudio Member Join Date: Apr 2005 Location: BA	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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23rd December 2005, 07:37 PM	#2
pmillett diyAudio Member 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: http://www.duncanamps.com/technical/pspicetubes.html Pete

26th December 2005, 02:49 PM	#3
Antonix diyAudio Member Join Date: Apr 2005 Location: BA	OK. I have solved the problem placing a 0 volt ground to circuit.

26th December 2005, 02:54 PM	#4
Antonix 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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