Custom mosfet model for LTSpice

Discussion in 'General Electronics Chat' started by kyka, Dec 15, 2015.

  1. kyka

    Thread Starter New Member

    Jun 7, 2015
    22
    1
    Hello everyone,

    In almost every electronics textbook, the drain current of a mosfet is been given by the quadratic equation

    I=(k/2)*(W/L)*(Vgs-Vt)^2*(1+Vds/Va)

    where k, W, L, Vt and Va are parameters based on the manufacturing process. The question is; how do I set these parameters in LTSpice?

    It allows me to use only predetermined transistor models which don't have the parameters that I want and I am not even sure if the obey the above equation.
     
  2. MikeML

    AAC Fanatic!

    Oct 2, 2009
    5,450
    1,066
    Read the help file. Too long to reproduce here:

    help.gif
     
  3. wayneh

    Expert

    Sep 9, 2010
    12,100
    3,034
    Are you familiar with the LTspice group on Yahoo? A lot of experts over there. They may have the answer if you don't get it here.
     
  4. kyka

    Thread Starter New Member

    Jun 7, 2015
    22
    1
    OK, I'll give it a look. Thank you both.
     
  5. Bordodynov

    Active Member

    May 20, 2015
    637
    188
    Model mos Level=1.
    k=Kp, W=W, L=L, Vt=Vto and Va=1/Lambda.
    When using four symbols NMOS4 and PMOS4 transistors can be set in their geometrical dimensions (W, L, AD, AS, PD, PS), and the multiplicity M. For example M=3, the three transistors in parallel.
     
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