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Spectre or Symbol View

wgtkan

Hello,

What is the appropriate view name to be used in instantiated device component or cell (transistor, resistor, capacitor, inductor, voltage source, and current source)?

Symbol or Spectre view? I have seen some cases where designer use Spectre view for some cells such as transistors, voltage source (vdc, vpwl, and so on) and some cases where they use Symbol view. But for global cell such as gnd they always stick with the symbol view

Does it depend on the model file (bsim or psp) one is using?

Thank you very much indeed.

Parents

  • The convention is to instantiate the symbol view, and the spectre view is what the netlister switches into and then determines that it should stop expanding the hierarchy.

    About the only benefit I can think of instantiating the spectre view is if you have inherited connections (e.g. a three terminal symbol, with the bulk pin only on the spectre view with a netExpression on the pin). Then you'd have the choice of instantiating something with a physical bulk pin that you could wire up.

    Otherwise I would recommend always installing the symbol view. It's a bit odd to instantiate the stopping view otherwise...

    It does not depend on the models you're using.

    Regards,

    Andrew.

Reply

  • The convention is to instantiate the symbol view, and the spectre view is what the netlister switches into and then determines that it should stop expanding the hierarchy.

    About the only benefit I can think of instantiating the spectre view is if you have inherited connections (e.g. a three terminal symbol, with the bulk pin only on the spectre view with a netExpression on the pin). Then you'd have the choice of instantiating something with a physical bulk pin that you could wire up.

    Otherwise I would recommend always installing the symbol view. It's a bit odd to instantiate the stopping view otherwise...

    It does not depend on the models you're using.

    Regards,

    Andrew.

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