How to plot frequency characteristic of capacitance?

Hi Kawai,

I don't see why:

imag(i("/C1/PLUS"))/(2*3.1415926535*xval(v("/something")))

(or similar) doesn't work. If you can plot xval then you should be able to divide by it (unless you have 0 in the frequency range?)

Perhaps you can give the actual expression and the error message.

Andrew.

Hi Andrew.

Thanks a lot for your reply.

The expression is as folows.

(imag(IF("/C1/PLUS")) / (2 * 3.14 * xval(IF("/C1/PLUS"))))

The error message is as follows

----------------------------------------------

WARNING (OCN-6038): Results ac are not available for /"~~Simulation Path~~"/distributed/job105/psf. Use results() for a list of available results.
*Error* imag: can't handle imag(nil)

WARNING (OCN-6038): Results ac are not available for /"~~Simulation Path~~"/distributed/job105/psf. Use results() for a list of available results.
*Error* xval: can't handle xval(nil)

*Error* ("times" 0 t nil ("*Error* times: can't handle (6.28 * nil)"))

ERROR (ADE-1057): Could not evaluate expression
        '(imag(IF("/C1/PLUS")) / (2 * 3.14 * xval(IF("/C1/PLUS"))))'
     because of the following error(s)
        ("times" 0 t nil ("*Error* times: can't handle (6.28 * nil)"))
     Ensure that the definition of the expression is correct.

-------------------------------------------------

I found that in case of using calculator (post simulation) above expression seems to work. It returns 1e-12 independent to frequency.

I test xval only "xval(VF("/net01"))" but it doesn't work today.

Best regards.

Kawai.

Hi Kawai,

It sounds as if you're just not looking at the results properly - did you do what it suggests in the error and see what results() returns?

This is something that would be best handled with a webex with customer support, to be honest. Trying to debug it through the forums is going to be really hard - I can't see any logical explanation as to why it doesn't work...

Regards,

Andrew.

Hi Andrew.

I understand above expression works  appropriatly.

With calculator, frequency charactoristic is plotted.

As you say, Something is wrong in my operation or recognition.

I'd like to recheck manuals. Then ask custormer support.  

Thank you very much for your advice and kindness.

Best regards,

Kawai.

Hi Andrew.

I understand above expression works  appropriatly.

With calculator, frequency charactoristic is plotted.

As you say, Something is wrong in my operation or recognition.

I'd like to recheck manuals. Then ask custormer support.  

Thank you very much for your advice and kindness.

Best regards,

Kawai.