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varying inline subckt parameter with altergroup in Spectre

sunilm123

I am trying to vary the inline subckt parameter as :

inline subckt n1 (d g s b)
parameters ad=0
n1 (d g s b) n1 ad=ad
model n1 bsim3v3 
ends n1

a1 altergroup {
  model n1 bsim3v3 ad=1
}

But getting the following error :

Error found by spectre during hierarchy flattening.
ERROR (SFE-2201): "input.scs" 20: In altergroup `a1', model `n1'
differs from its previous definition in "input.scs", line 13.

Can I have any workaround for this .

Parents
  • Andrew Beckett

    That won't work because you're trying to change an instance of an inline subckt to be an instance of a model. You either need to create a global parameter and then vary that in the altergroup (or use an alter statement) as follows:

    //

    parameters n1_ad=0
    inline subckt n1 (d g s b)
    parameters ad=n1_ad
    n1 (d g s b) n1 ad=ad
    model n1 bsim3v3 type=n
    ends n1

    M1 (d g 0 0) n1
    V1 (d 0) vsource dc=1
    V2 (g 0) vsource dc=1

    dc1 dc
    inst info what=inst where=logfile

    a1 altergroup {
     parameters n1_ad=1.0
    }

    dc2 dc
    inst2 info what=inst where=logfile

    Or redefine the entire subckt:

    //

    inline subckt n1 (d g s b)
     parameters ad=0
     n1 (d g s b) n1 ad=ad
     model n1 bsim3v3 type=n
    ends n1

    M1 (d g 0 0) n1
    V1 (d 0) vsource dc=1
    V2 (g 0) vsource dc=1

    dc1 dc
    inst info what=inst where=logfile

    a1 altergroup {
     inline subckt n1 (d g s b)
      parameters ad=1.0
      n1 (d g s b) n1 ad=ad
      model n1 bsim3v3 type=n
     ends n1
    }

    dc2 dc
    inst2 info what=inst where=logfile

    Both work, I tested them.

    Regards,

    Andrew.

Reply
  • Andrew Beckett

    That won't work because you're trying to change an instance of an inline subckt to be an instance of a model. You either need to create a global parameter and then vary that in the altergroup (or use an alter statement) as follows:

    //

    parameters n1_ad=0
    inline subckt n1 (d g s b)
    parameters ad=n1_ad
    n1 (d g s b) n1 ad=ad
    model n1 bsim3v3 type=n
    ends n1

    M1 (d g 0 0) n1
    V1 (d 0) vsource dc=1
    V2 (g 0) vsource dc=1

    dc1 dc
    inst info what=inst where=logfile

    a1 altergroup {
     parameters n1_ad=1.0
    }

    dc2 dc
    inst2 info what=inst where=logfile

    Or redefine the entire subckt:

    //

    inline subckt n1 (d g s b)
     parameters ad=0
     n1 (d g s b) n1 ad=ad
     model n1 bsim3v3 type=n
    ends n1

    M1 (d g 0 0) n1
    V1 (d 0) vsource dc=1
    V2 (g 0) vsource dc=1

    dc1 dc
    inst info what=inst where=logfile

    a1 altergroup {
     inline subckt n1 (d g s b)
      parameters ad=1.0
      n1 (d g s b) n1 ad=ad
      model n1 bsim3v3 type=n
     ends n1
    }

    dc2 dc
    inst2 info what=inst where=logfile

    Both work, I tested them.

    Regards,

    Andrew.

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