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bbspice fitting process taking too much time

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

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Andrew Beckett over 4 years ago
Anh,

I would suggest the following:

Read the latest version of Tawna's 7 Habits of Highly Successful S-Parameters (Spectre 20.1, 19.1 and IC6.1.8 ISR9) guide

Use SPECTRE20.1 not SPECTRE16.1 - there have been numerous improvements to the simulator and to bbspice (particularly in the latest versions) - so I'd strongly encourage you to check that

This is covered in Tawna's guide, but checking how smooth your s-parameters would be a good idea; a 1GHz step is pretty large...

Contact customer support - this will be much easier to analyse and help with if we can actually see your data.

Andrew
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Andrew Beckett over 4 years ago
Anh,

I would suggest the following:

Read the latest version of Tawna's 7 Habits of Highly Successful S-Parameters (Spectre 20.1, 19.1 and IC6.1.8 ISR9) guide

Use SPECTRE20.1 not SPECTRE16.1 - there have been numerous improvements to the simulator and to bbspice (particularly in the latest versions) - so I'd strongly encourage you to check that

This is covered in Tawna's guide, but checking how smooth your s-parameters would be a good idea; a 1GHz step is pretty large...

Contact customer support - this will be much easier to analyse and help with if we can actually see your data.

Andrew
Cancel
Vote Up 0 Vote Down

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