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How to change the parameters of a Transistor (Pcell)

Sathvik44 over 2 years ago

Hello,

I have been trying to change the parameters(length and width) of a transistor from PRIMLIB.

I used the below command and have tried changing the parameters as follows:

instID=dbCreateInst(cellviewID master "I0" 1:1 "R0" 1)

instID ->l="2u"

instID->w="2u"

when I used the above commands to change the parameters, only the length of the transistor is changed but not the width.

The instID->w is changing the Width Stripe to 2u but not the width of the transistor.

I have even tried using dbCreateParamInst() but the same thing is happening.

Please let me know how to change the width of the transistor.

Sathvik

Kevin Buck over 2 years ago

The total width is likely updated by a callback function which is not executed when you modify a property in SKILL. There is a built in function that forces execution of callbacks but I don't recall the name and I'm writing this reply from my mobile phone. You could also update the total width parameter as well as the finger/stripe width as it is just a simple multiplication operation.
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Andrew Beckett over 2 years ago in reply to Kevin Buck

I don't know the parameters used by PRIMLIB (which is a library from a specific foundry), but presumably you're not setting the correct parameters as Kevin mentioned. Most likely you'll need to call the callbacks - there's not a built-in function to do this, but you can use the code in my article 11018344 to achieve this.

Andrew
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Kevin Buck over 2 years ago in reply to Andrew Beckett

Oops, I thought it was a built in function but I knew I had seen it before!
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