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Difference parameter and iPar

Clidre

Hello,

I have a question about iPar.

What is the difference between using a parameter and using iPar? Example: In a Mosfet instance, I put

Length=Ln   

Width=2*iPar("Ln")

 

So I need to put the parameter Ln and then I use iPar to refer to that parameter. But I can also put

Length=Ln   

Width=2*Ln

 

And it works the same. Thus I don't understand the usefulness of iPar and the difference between the 2 examples above.

 

Thanks!

  • Hi,

    The iPar() statement obtains the value of the instance parameter from that same instance, and this should work whether the parameter is a fixed number or a design variable or even another expression to be evaluated.  In the second case it looks like you either have a global variable or a design variable "Ln" which is being used in both instance parameters.  I think that the first case is the most flexible.

    I'm sure that Andrew might also be able to offer more insight, but in my opinion the first method, using iPar(), is the way to go.

    Hope this helps,

    Lawrence.

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