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  3. Virtuoso Schematic shows graphically different values than...

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Virtuoso Schematic shows graphically different values than query

WRM
WRM 7 months ago

Hi,

I'm facing an issue with an schematic automatically generated. FET instances show different values on display than when queried. Please see pics.
The correct values are the ones shown graphically. I tried to fix this by running 'abInvokeCdfCallbacks' but the results are undesired, the values graphically were set to the ones queried.

Thanks for your help.

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  • Andrew Beckett
    Andrew Beckett 7 months ago

    In order to understand this, I suggest you take a look at the CDF definition (Tools->CDF->Edit in the CIW) to see what the parameter names are corresponding to "Width Single Finger" and "Width All Fingers". I suspect there's a callback on these which computes other values, and maybe "wt" is another parameter which is not directly set by the user but computed. In such cases you might need to use the ?order argument of abInvokeCdfCallbacks to adjust the order in which they are called, but it would still require the basic parameters to have been correctly set (I suspect they are not).

    I was going to try to download the PDK (I assume this is a GF PDK) but because of an issue in their portal after a recent change, I cannot currently access anything...

    Regards,

    Andrew

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  • WRM
    WRM 7 months ago in reply to Andrew Beckett

    Hi Andrew,

    Thanks for your reply. I checked the CDF definition and wt (Width All Fingers) contains a callback function. As you mentioned the basic parameter, in this case wf (Width Single Finger), is not set correctly. When the device in the picture is queried it shows the default value and not the one shown graphically. I guess, the query command (Q bindkey) tries to show the value from the database (the one shown graphically) but it is not successful and shows instead the default value, which in this case 120n. If this true, how can you retrieve the correct parameter wf of the device, the one shown graphically?
    Yes, the PDK is from GF.

    Regards,

    Wilfredo

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