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change temperature in one single transient simulation

enzhu

Hi 

I know we can change temperature in one single transient simulation by using the Dynamic Parameter and put "Parameter Name" as temp.

There are two options there: One for Parameter Vector (that we can input the time step and temperature) and I am fine with option.

Another option is to include a parameter file. But I don't know the format for the parameter file. Could anyone show me some examples for this? If you could show me two examples: one for temperature and one for a general parameter (say for voltage levels for a DC source, etc), that would be great. 

Thank you very much. 

Andrew

  • Andrew Beckett

    Hi Andrew,

    The format is just two numbers on each line - the first number is the time, the second number is the value you want to have for the parameter. I think (without checking) it can be both space or comma-separated.

    So the format is identical whether it's a temperature or a voltage - it's just time-value pairs.

    Regards,

    Andrew.

  • enzhu
    in reply to Andrew Beckett

    Hi Andrew,

    I have tried a temp_file like this

    0 60

    20u 80

    40u 100

    But it has error report:

    ERROR (SPECTRE-16551): format error. It should be Time Value.

    I remember we need a specific line on the front before we write the pairs, but I forgot. 

    Thanks. 

    Andrew

  • Dimitra Papazoglou
    in reply to enzhu

    Hi Andrew,

    You must have "tscale" and "time value" in the file.

    Try that:

    tscale 1e-6

    time   value

    0       60

    20       80

    40      100

    Regards,

    Dimitra

  • enzhu
    in reply to Dimitra Papazoglou

    Hi Dimitra,

    Great! It works perfectly! 

    By the way, the tscale is for temperature. Do you happen to know how to write for a voltage or current parameters? 

    Thanks again. 

    andrew

  • Andrew Beckett
    in reply to enzhu

    Thanks Dimitra for the correction. Serves me right for trying to answer this quickly without actually checking! BTW Andrew, this is documented if you look at "spectre -h tran" - it explains the format at the end.

    The tscale is not for temperature. It's the scaling of the time values - what that means is that it multiples the time values by that scaling factor.

    Regards,

    Andrew.

  • enzhu
    in reply to Andrew Beckett

    Hi Andrew,

    Thanks for clarification and all are working for me now:)

    Great help! 

    Andrew

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