Nonlinear resistors

Thread Starter

Ahmed Adel

Joined May 12, 2008
18
hi engineers ...

i am new to Multisim and i have a question ... how can i insert a non linear resistor to my project ...??

please help urgently

thank you in advance ...
 

Caveman

Joined Apr 15, 2008
471
I'm not sure about a simpler way, but you can use a behavioral current source, Bxx. The current through the device is defined by a function of a voltage. If you make that voltage the same as the voltage across it, then you can create any V-I curve you want.
 

Thread Starter

Ahmed Adel

Joined May 12, 2008
18
thanks caveman for help ... but please provide more details because i couldn't get the idea and i am still having the problem
 

Caveman

Joined Apr 15, 2008
471
I'm more familiar with LTspice than multisim, but they all share the basics. An arbitrary behavioral current source is denoted by
B1 n001 n002 I=(V(n001) - V(n002))^2

This would be a device connected between node n001 and node n002. The current through the device equals the voltage across the device squared. If you wanted a normal 10k resistor with this method, you would write:
B2 n001 n002 I=(V(n002)-V(n001))/10k

Does this make sense?
 
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