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Displaying the values of DCopinfo

wgtkan

Hello,

I would like to display DC  operation information. Here is what I have done. I created a text file and named it save_all.scs to save the dc operating point

of my transistors and inside it put the name of the transistors information that I want to to be saved as follows:

save T1:oppoint
save T2:oppoint
save T3:oppoint
save T4:oppoint
save T5:oppoint
save T6:oppoint

And then went to adexl >model files and attached save_all.scs.

When the simulation run finished, I went to the result browser and dcOp and  It is displaying the operating point parameters but there is no value listed beside the parameters. 

I am using PSP103 model parameters.

My cadence virtuoso version is :
Version IC6.1.8-64b.500.9
Spectre spectre191

Here is what is being displayed:

Instead of this:

Thank you so much in advance for your help. 

Parents
  • ShawnLogan

    Dear wtgkan,

    wgtkan said:

    I created a text file and named it save_all.scs to save the dc operating point

    of my transistors and inside it put the name of the transistors information that I want to to be saved as follows:

    Perhaps I am not able to see the entire "save_all.scs" file,  but it appears you did not include the following line as the first line in your "save_all.scs" file. I believe this is needed to indicate the syntax of the file is spectre.

    simulator lang=spectre.

    Shawn

  • Andrew Beckett
    in reply to ShawnLogan

    If the file has the suffix ".scs" there is no need to add "simulator lang=spectre" since the .scs suffix indicates that it is in Spectre syntax anyway.

    In this case it appears the save is working, but for some reason (and I don't know what the simulation setup looks like) the results are waveforms not single values. That would happen if you'd done a dc sweep, or a transient analysis - or maybe you've done some kind of parametric analysis around the dcOp - I don't know. However, if you plot the operating point waveforms, you get a value versus the swept variable.

    Note there's no need to do the save if you're normally just looking at dcOp (operating point) data from an operating point analysis. The save is only needed normally if you are wanting to plot operating point versus time or versus a dc sweep.

    Regards,

    Andrew.

Reply
  • Andrew Beckett
    in reply to ShawnLogan

    If the file has the suffix ".scs" there is no need to add "simulator lang=spectre" since the .scs suffix indicates that it is in Spectre syntax anyway.

    In this case it appears the save is working, but for some reason (and I don't know what the simulation setup looks like) the results are waveforms not single values. That would happen if you'd done a dc sweep, or a transient analysis - or maybe you've done some kind of parametric analysis around the dcOp - I don't know. However, if you plot the operating point waveforms, you get a value versus the swept variable.

    Note there's no need to do the save if you're normally just looking at dcOp (operating point) data from an operating point analysis. The save is only needed normally if you are wanting to plot operating point versus time or versus a dc sweep.

    Regards,

    Andrew.

Children
  • wgtkan
    in reply to Andrew Beckett

    Thank you Andrew and Shawn.

    I did a DC sweep around the Gate to Source Voltage.

    To  display the value without plotting the DC operating point parameters, what should I do? 

  • Andrew Beckett
    in reply to wgtkan

    Again, I'm having to guess because you've not shown what you've run - and a very quick response as I'm on vacation today. All you should need to do is turn on the "Save DC Operating Point" checkbox on the dc analysis form, and then look in the dcOpInfo database in the results. No need to have save statements. The save statements are useful if you want to plot the dc operating point information versus your dc sweep (and you can also do that via Outputs->To be saved->Select OP Parameters these days rather than requiring an include file).

    Andrew.

  • wgtkan
    in reply to Andrew Beckett

    Andrew,

    Thank you very much indeed.
    Enjoy your vacation.

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