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Sweeping Vth vs L

Arjun RP

Hi all,

I am Arjun, Graduate student pursuing IC Design. I am trying to sweep the Vth of transistor with respect to its length. I saved a file with .scs extension and with the content save M0:all. I selected DC analysis and in the sweep i selected component parameter and transistor M0 where i selected its length "l". I also included the .scs file into model library. But when i run the simulation i am getting a error as given below. 

ERROR (SFE-430) : 'dc' : Sweeping the parameters of a subcircuit instance ('M0') is currently not supported. Please use the spectre sweep instead.

Spectre terminated prematurely due to fatal error.

 What should i do to overcome this error ? Please help me 

Parents

  • The warnings are consistent with what I guessed might be the problem - I suspect that the model is a subckt and so saving M0:all is not correct - you need to save M0.instNameOfTransistor:all (where instNameOfTransistor is the name of the instance within the subckt model). You'll need to look in the model files to find out the name of the instance.

    Alternatively, use:

     save *:all devtype=bsim4

    which will save everything for all bsim4 instances - so that should do it. Might be simpler than trying to figure out the instance name...

    Regards,

    Andrew.

Reply

  • The warnings are consistent with what I guessed might be the problem - I suspect that the model is a subckt and so saving M0:all is not correct - you need to save M0.instNameOfTransistor:all (where instNameOfTransistor is the name of the instance within the subckt model). You'll need to look in the model files to find out the name of the instance.

    Alternatively, use:

     save *:all devtype=bsim4

    which will save everything for all bsim4 instances - so that should do it. Might be simpler than trying to figure out the instance name...

    Regards,

    Andrew.

Children
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