Callback for instance parameters

Discussion in 'Cadence' started by Andreas Dreyfert, Jul 9, 2003.

  1. Hi,All

    I have a problem that has bothered me for a while that is caused by the
    design kit for icfb.

    Why do many design kits use callbacks in the CDF to calculate parameters
    such as source/drain area of transistor?
    When things are implemented this way you can not use some functions in
    the simulator. For example you can not sweep the width of a transistor
    and get correct results because the parasitics were calculated for the
    initial width in the schematics

    Would it not be better to implement such function in the models? So that
    functions such as sweep can be used.

    This is no big problem but it makes the tool more difficult to use.

    Andreas Dreyfert, Jul 9, 2003
  2. Andrew Beckett, Jul 9, 2003
  3. I colud not agree more with you!

    But why do certain kit developers who know better still use them?
    As you stated in your earlier comments they appear very attractive. But
    if they limit the possible usage of your other products. One would think
    that one would try to use other ways of implementing such functions then
    it is possible.

    I have used your skill code example from your earlier comments to get
    around the problem. But if I run lots of short simulations and change
    the schematic in database between every run the time consumed by
    changing the database,netlisting and other stuff will be significant. If
    one instead could use the alter (or other) function in spectre you would
    not need to change the database or renetlist at all!

    Andreas Dreyfert, Jul 10, 2003
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