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bbspice fitting process taking too much time

anhchu88

Hi,

I have an S parameter file generated by EMX for my oscillator. It has 56 ports and was simulated from DC-900GHz with a 1GHz step. When I used bbspice as the interpolation method for the nport, the rational fitting takes almost 1 day and still has not finished. Could you suggest some techniques I could use to reduce the fitting time? Here I have kept the nport compression as default. I'm curious since Tawna mentioned in an earlier thread that she used to simulate an n-port with 405 ports (https://community.cadence.com/cadence_technology_forums/f/rf-design/37979/how-to-compare-what-spectre-interprets-from-the-raw-s-parameter-file/1352837#1352837).

I'm using Spectre Version 16.1.0.510.isr10 64bit -- 13 Oct 2017, Virtuoso IC6.1.7-64b.500.15, EMX 5.12, interface date 15/7/2020.

I include here the settings for my nport, and the screenshot from transient simulation showing the iterations of the fitting process.

Many thanks and regards,

Anh


Parents

  • Hi Anh,

    As a follow on to Andrew (I agree with everything  he said), update your Virtuoso version to IC6.1.8 ISR9/ICADVM18.1ISR9 or later.  We've made improvements to the nport in ISR9.  We have even more nport enhancements scheduled for ISR16 due out next month!  (I won't divulge anything...no spoilers.  :-)   )

    best regards,

    Tawna

Reply

  • Hi Anh,

    As a follow on to Andrew (I agree with everything  he said), update your Virtuoso version to IC6.1.8 ISR9/ICADVM18.1ISR9 or later.  We've made improvements to the nport in ISR9.  We have even more nport enhancements scheduled for ISR16 due out next month!  (I won't divulge anything...no spoilers.  :-)   )

    best regards,

    Tawna

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