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dynamically display transistor parameters on symbol

RicardoCaseiro

In Cadence Virtuoso 6.1.8, I have a schematic called MYINV, which contains two pcells: transistor MN and transistor MP.

Each transistor (PDK pcell) has parameters for width (w) and length (l), with specific values assigned.

I want to dynamically display the value of the w and l parameters of transistor MN on the MYINV symbol.

For example, if I set the width (w) to 1u, it should display "1u" on the symbol. If I later change the width (w) to 2u, the symbol should automatically update and show "2u".

Ppar isn't a solution since  it brings a value from symbol to schematic and I want to do the opposite.

Ppar has a limitation as well because of the pcell callback to calculate other prameters for simulation.

Thank you for your help.

  • You already have a support case open for this, which one of my team is trying to find a way to resolve (I have been working with her to suggest solutions; the fact that the PDK doesn't handle pPar properly is new information - sadly some PDKs are implemented in a way that breaks the use of pPar). There isn't really a direct way of handing downwards parameter lookup which is what you need here - but I'm working with my colleague to see whether we can suggest something that is not too complicated to implement.

    Anyway, we'll follow this up through the support case rather than duplicating effort here.

    Regards,

    Andrew

  • in reply to Andrew Beckett

    Hi Andrew,

    Thank you for your support. 

    Looking for your feedback and hopefully we can find a way.

    Best regards,

    Ricardo

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