spectre bsim3v3 model parameters : ps & pd

Discussion in 'Cadence' started by S. Badel, Oct 30, 2003.

  1. S. Badel

    S. Badel Guest

    these are perimeters of source and drain diffusions, well.

    what should i put as value :
    - 2*(width+length)
    or
    - 2*width + 1*length
    considering that the gate-side of the junction doesn't
    contribute to capacitance

    ?

    thanks,
    stephane
     
    S. Badel, Oct 30, 2003
    #1
  2. S. Badel

    Erik Wanta Guest

    Stephane:
    Why wouldn't it be ps=pd=2l+w as there is only one w is along the
    gate? I could be wrong but I think spectre gives default as, ad, ps,
    pd values if not given. I think hspice has a parameter called acm to
    control these values.
     
    Erik Wanta, Nov 2, 2003
    #2
  3. S. Badel

    S. Badel Guest

    A colleague found the answer and it was indeed
    the main source that caused different results between
    hspice and spectre.
    spectre wants the complete perimeter as parameter value,
    that is, 2w+2l
    while hspice is expecting only three sides, that is, 2w+l.
    most probably spectre does substract w during processing.
    thanks for your reply,
    stéphane
     
    S. Badel, Nov 3, 2003
    #3
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