Nonlinear resistors

Discussion in 'General Electronics Chat' started by Ahmed Adel, May 12, 2008.

  1. Ahmed Adel

    Thread Starter Member

    May 12, 2008
    18
    0
    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 ...
     
  2. Caveman

    Active Member

    Apr 15, 2008
    471
    0
    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.
     
  3. Ahmed Adel

    Thread Starter Member

    May 12, 2008
    18
    0
    thanks caveman for help ... but please provide more details because i couldn't get the idea and i am still having the problem
     
  4. Caveman

    Active Member

    Apr 15, 2008
    471
    0
    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?
     
  5. Ahmed Adel

    Thread Starter Member

    May 12, 2008
    18
    0
    Thank you caveman for help ...

    yeah sure ... i got what u said ... thanks again
     
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