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Quantus QRC generates "nan" valued resistors. Spectre throws an error and halts simulation

magal

Hi.

I'm running Quantus RLCK and I noticed that sometimes it creates on or two "nan" valued resistors (either using ladder-network model or not).

This doesn't happen for RC extraction.

The problem is that spectre then halts simulation and throws: " parameter `r': Cannot run the simulation because an unknown parameter `nan' has been specified in expression `-nan'. Correct the expression and rerun the simulation."

Am I doing something wrong? Currenlt, the best I can do is tweak layout to prevent there resistances from being generated

Assura: 4.1_USR6_HF3

Quantus version: 19.1.3-s062

Spectre: 161 through 191, latest USRs

Cheers,

Matan

Parents

  • The issue is almost certainly related to the technology data you're using or some issue with the Quantus version. I'd suggest you contact customer support. I've seen examples where it's either the tool or the technology files for Quantus - and without knowing more about your technology that's going to be hard to diagnose - hence the suggestion to go to customer support.

    Andrew.

  • in reply to Andrew Beckett

    Thanks for the prompt reply. Will talk to customer support. I've narrowed down the occurrence of the "nan" resistor to the point where a metal trace connects to an RF-pcell in the layout.

    In other words - I think QRC expects the trace to be connected to a certain point in the (excluded BTW) RF-pcell, and otherwise detects an OC (?).

    Thanks again for the advice.

    Matan

Reply
  • in reply to Andrew Beckett

    Thanks for the prompt reply. Will talk to customer support. I've narrowed down the occurrence of the "nan" resistor to the point where a metal trace connects to an RF-pcell in the layout.

    In other words - I think QRC expects the trace to be connected to a certain point in the (excluded BTW) RF-pcell, and otherwise detects an OC (?).

    Thanks again for the advice.

    Matan

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