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Changing instance model by alter statement

ChrisEAS

For a corner simulation, I would like to change the model name of a single instance. I can easily be done using SKILL, but I would like to use the Spectre alter statement for that. Is there a way to do it? Maybe something like that ...

alter1 dev=M0 param=model value=new_model_name 

 - Chris 

Parents
  • ChrisEAS

     Thanks, I might ask there.

    Another problem I ran into: I would like to parametrise a model, so I created an inline subcircuit containing only a model statement as described in the manual. Then I instantiate the model subcircuit and use the instantiated model for my device as follows: 

     

    inline subckt new_model_subckt
      parameters dvt=0
      model new_model_subckt old_model vth0=0.5+dvt
    ends new_model_subckt

    new_model new_model_subckt

    M0 (net1 net2 0 0) new_model l=1u w=1u

     

    However, Spectre doesn't seem to like it and stops halfway through without an error message. Do you have an idea what's wrong here? Is there a way to parametrise a model without having to create a subcircuit containing the device instance?

    Chris 

Reply
  • ChrisEAS

     Thanks, I might ask there.

    Another problem I ran into: I would like to parametrise a model, so I created an inline subcircuit containing only a model statement as described in the manual. Then I instantiate the model subcircuit and use the instantiated model for my device as follows: 

     

    inline subckt new_model_subckt
      parameters dvt=0
      model new_model_subckt old_model vth0=0.5+dvt
    ends new_model_subckt

    new_model new_model_subckt

    M0 (net1 net2 0 0) new_model l=1u w=1u

     

    However, Spectre doesn't seem to like it and stops halfway through without an error message. Do you have an idea what's wrong here? Is there a way to parametrise a model without having to create a subcircuit containing the device instance?

    Chris 

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