Voltage Controlled Resistor (VCR) in PSPICE student

rtarbell · 27th January 2010, 09:20 PM

Greetings!

Does anyone know how to create a true voltage controlled resistor in Pspice (using E, F, G, and H controlled sources)?

I found a great site on how to create a VCR using text-based Spice:

Voltage-Controlled Resistor

I am wondering if there is a way to do this in the graphical PSpice student version.

The problem I am having is defining the gain of a controlled source. In text-based Spice, you can make the gain of a controlled source variable (for instance, you can make the gain of a controlled voltage source equal to the current through one branch multiplied by the voltage across a resistor in another branch). I don't *think* you can do this in graphical Spice because the GAIN field of a controlled source requires a constant number - the program gives an error if I try to put some kind of equation in for gain.

jcx · 28th January 2010, 03:28 AM

why wouldn't you use LtSpice? BI, BV source equations work - no "student" limitations, free, active support

rtarbell · 29th January 2010, 01:25 PM

You're right jcx,

I should get into LTspice (I have it, but I haven't used it extensively yet). It appears that there is no "B" voltage or current source in Pspice student.

27th January 2010, 09:20 PM	#1
rtarbell diyAudio Member Join Date: Sep 2005	Voltage Controlled Resistor (VCR) in PSPICE student Greetings! Does anyone know how to create a true voltage controlled resistor in Pspice (using E, F, G, and H controlled sources)? I found a great site on how to create a VCR using text-based Spice: Voltage-Controlled Resistor I am wondering if there is a way to do this in the graphical PSpice student version. The problem I am having is defining the gain of a controlled source. In text-based Spice, you can make the gain of a controlled source variable (for instance, you can make the gain of a controlled voltage source equal to the current through one branch multiplied by the voltage across a resistor in another branch). I don't think you can do this in graphical Spice because the GAIN field of a controlled source requires a constant number - the program gives an error if I try to put some kind of equation in for gain.

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28th January 2010, 03:28 AM	#2
jcx diyAudio Member Join Date: Feb 2003 Location: ..	why wouldn't you use LtSpice? BI, BV source equations work - no "student" limitations, free, active support

29th January 2010, 01:25 PM	#3
rtarbell diyAudio Member Join Date: Sep 2005	You're right jcx, I should get into LTspice (I have it, but I haven't used it extensively yet). It appears that there is no "B" voltage or current source in Pspice student.