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I can't vary temperature in transient analysis

TiNat
Hello. Recently I have found the method varying temperature in transient analysis. I have tried repeat it, but I can't. I have created the following file: pset1 paramset { time reltol temp : 0 1e-3 27 100m 1e-3 50 500m 1e-4 75 1 1e-5 125 } and I've added paramset=pset1 to additional parameters in tran options. When I was running the simulation the output log file was like that: Simulating `input.scs' on tim-desktop at 9:26:09 PM, Mon Sep 27, 2010. Using new Spectre Parser. Error found by spectre during circuit read-in. "/home/tim/projects/TNY266/temp.scs" 2: Unexpected colon ":". spectre terminated prematurely due to fatal error. When I've deleted ":" from my file, the simulation started but the temperature wasn't vary. Help me please, why it occured? Thank you for your solution.
  • Did you try splitting it over several lines:

    pset1 paramset {
    time reltol temp
    0 1e-3 27
    100m 1e-3 50
    500m 1e-4 75
    1 1e-5 125
    }

    I think (without checking or testing) that the line of parameter names needs to be separate.

    Regards,

    Andrew
  • I splitting it over several lines in my file but at forum all line were wrote in one line. The syntax of my file is like you suggested.

  • Which version of spectre were you using? I've attached a zip file containing a netlist (tvary.scs) and the resulting log file from spectre, and a png file showing a picture of how the voltage across a resistor changes throughout the simulation. It works fine for me...

    Regards,

    Andrew.

    tvary.zip
  • My system info. as following: icfb : 5.10.41; version of spectre is 6.0.2. Does this version of spectre support variation temperature in transient analysis?
  • Dynamic parameter support was added in MMSIM62. So in the release you're using you can define a paramset but you cannot specify a paramset=pset1 parameter on the tran analysis. I'd expect you to see a warning about this in the spectre output.

    Is there a good reason to be using a 6 year old version of spectre? There have been 5 major releases of MMSIM since then (and there is another one due very soon) so there is very little good reason to use such an old version.

    Regards,

    Andrew
  • I try to account for using old version of spectre. I'm learning the Cadence Software, but as an illustration I use the circuits that were developed a long time ago and were in old versions of Cadence and I try to simulate in MMSIM 6.0 . Of course, In future I'll use new version of spectre.

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