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variation on chennel length in hspice models

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liz16

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Hi, I'm simulating variation on device parameters like vth, leff, tox with hspice. For variation on vth & tox, we must define variation on device parameters that are mentioned in the libraries, such as BSIM, including TOXP , VTH0:

Code: 
  .Global_Variation
      Parameter var=N() Y='180 + 8.02 * var' Z='17.5 + 0.37 * var'
      Nmos N1
  + VTH0=Perturb('Y')

But what's the name of device parameter in the library for Leff?
Is it LINT or LL or LLN? In the BSIM reference, I didn't find any except these.:?:
 

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