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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

  • Thanks a lot for your efforts and sorry for giving a rather fuzzy description of my problem!
    So here's a second try:
    In the "preparing input data files" for the model trainer section of the VPCM user guide it is said that one has to add the geometry information of the coil to the BsimProPlus RF file containing the s-parameter data obtained from EM-simulations. There, apart from the width, the spacing, etc. one also has to specify the shape of the inductor. Unfortunately, the VPCM user guide does not say how you specify a circular spiral inductor 8 stands for octagon and I found by trial and error that 4 stands for rectangular, but I have no idea which number denotes a circular one.
    I hope that was more precise then last time,
    Jens


    Originally posted in cdnusers.org by jenand
Reply

  • Thanks a lot for your efforts and sorry for giving a rather fuzzy description of my problem!
    So here's a second try:
    In the "preparing input data files" for the model trainer section of the VPCM user guide it is said that one has to add the geometry information of the coil to the BsimProPlus RF file containing the s-parameter data obtained from EM-simulations. There, apart from the width, the spacing, etc. one also has to specify the shape of the inductor. Unfortunately, the VPCM user guide does not say how you specify a circular spiral inductor 8 stands for octagon and I found by trial and error that 4 stands for rectangular, but I have no idea which number denotes a circular one.
    I hope that was more precise then last time,
    Jens


    Originally posted in cdnusers.org by jenand
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