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Import Touchstone® Files into ADS with a Dual-in-line Symbol

Posted June 4th, 2014 · 2 Comments · Video

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In ADS, the default SnP symbols (for example the ones on the Data Items pallette) are aimed at RF/microwave applications. For signal integrity and power integrity applications, I like to use dual-in-line symbols (with odd-numbered pins on the left side and a even on the right) instead. This short video clip titled Import Touchstone® Files into ADS with a Dual-in-line Symbol shows you how I do it. It works with any port count large or small (I used an *.S256P in this video) and it also supports two styles of “comment field port names” that have become fairly common. Please leave a comment on this method. Thanks!

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2 Comments so far ↓

  • Wing Hock

    Hi ,
    If I have a Cadence brd file, what is the best way to generate the Touchstone V2 file for SI /PI simulation?

    My understanding is that the power traces impedance of 0.1 ohm while the signal traces is 50 ohm.

    • Colin Warwick

      Hi Wing, Import the board using ADFI flow and set the port reference impedences as you mention. You’ll get the best numerical accuracy if the reference impedence is close to the characteristic impedance. You can get a rough feel for the characteristic impedances using my “Form Factor” posting. http://signal-integrity.tm.agilent.com/2009/geometric-form-factor-for-transmission-lines/ The look-alike component that you place into the schematic will automatically have teh right settings. There’s no need to export anything. In the unlikely event you do need to export with per-port reference impedances, you can use CITI file format. Presently we import and export Touchstone 1 but we only import Touchstone 2. Hope this helps!

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