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How to setup and simulate differential TDR

Piash

Hi,

I want to do differential TDR simulation in cadence virtuoso. I have a differential channel, made of Tlines and interconnects (passive componenets). How to setup the TDR simulation to get impedance over time? I know, I have to terminate both n and p channel with 50 ohm each at the output. I have to do also in the input. But how to connect the step voltage source or pulse generator at the input and get the recuiredimpedance over time from the channel reflection? Can anyone help me.

Note: I am using virtusos version IC6.1.7-64b.500.4, there is no rflib. So I cannot use Balun ports.

  • Andrew Beckett

    Hmm, you deleted your original post (which was in the Custom IC Design forum) and then re-posted it in the PCB Design forum, where folks are unlikely to use Virtuoso. Luckily I spotted this as I was about to respond and so I've moved this post back to the Custom IC Design forum.

    Anyway, spectre does have a "tdr" analysis but it's not available in the ADE UI because it is very rarely used. One of my colleagues very recently went through the process of getting this up and running; I've just asked him for his database so I can play with this (rather than me spending time repeating what he did from scratch) - if I find anything I'll post here.

    There is rfLib in that version of IC617 - no idea why you think there isn't?

    Regards,

    Andrew 

  • FormerMember
    FormerMember in reply to Andrew Beckett

    Hi Andrew,

    I am having similar requirement and wondering if you have any updates to share on the TDR analysis using spectre.

    Thanks,

    Vishal

  • Andrew Beckett
    in reply to FormerMember

    Hi Vishal,

    No updates. The analysis in Spectre remains the same, and there has been no update to ADE to add support. If you need this, I would suggest you contact customer support to help with prioritisation and also to ensure that what Spectre provides is actually what you want.

    Regards,

    Andrew.

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