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modeling spiral inductors

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Hello all,
I tried to model on-chip spiral inductors according to the SpectreRF User Guide. To this end, I wrote the process file according to my process data (AMS 035 HV), inserted the inductor symbol from the passiveLib and specified the geometrical data in the CDS window. For some reason, the parameter extraction that is performed prior to simulation only works for a rectangular shaped inductor (and not for octagonal and circular shapes). The error message in the log file looks as follows:

Internal err: dist_bet_pt_and_fil: why is t = 1?


Also, the inductance values that are extracted for the rectangular case are not conform with those calculated by other tools/formulae (Wheeler, performing integration in MATLAB, Mohan equation from Tom Lee's book) but differ by a factor of 15.

Thanks in advance for any advice.

Best regards,
Jens


Originally posted in cdnusers.org by jenand
Parents

  • Apologies for the delay - been a bit busy recently...

    Not quite sure I understand. Are you synthesizing a circular inductor? What exactly are you having to edit, and at which point?

    Regards,

    Andrew.


    Originally posted in cdnusers.org by adbeckett
Reply

  • Apologies for the delay - been a bit busy recently...

    Not quite sure I understand. Are you synthesizing a circular inductor? What exactly are you having to edit, and at which point?

    Regards,

    Andrew.


    Originally posted in cdnusers.org by adbeckett
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