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L's and C's and Bsource

kevinv

HI All,

I was really excited once I saw that the spectre L and C elements support poly coeff's and can be used to model Voltage and Current variations...  BUT  I was VERY dissapointed to see that these variations are POLARITY dependant... 

 Meaning-  if you try to model inductor current saturation effects using the Coeff's matrix...  -  you get the wrong result if the current happens to be going the "wrong" direction through the inductor.

 So-  I thought about using a bsource instead...   

1)  Am I missing something wrt the Coeff's issue?

2)  If I switch to using a bsource-  is there a schematic element for it?  I don't see one.

 

Thanks!

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  • kevinv

    Many thanks for the reply.

     I understand your comments if they relate to integrated (on-chip) elements but are you claiming that even external components are not symmetric?

     For example-  are the saturation effects in an external (discrete) inductor dependant on current flow direction?   I can't think of a reason that this would be but I've certainly been wrong before   :)

     

     

Reply
  • kevinv

    Many thanks for the reply.

     I understand your comments if they relate to integrated (on-chip) elements but are you claiming that even external components are not symmetric?

     For example-  are the saturation effects in an external (discrete) inductor dependant on current flow direction?   I can't think of a reason that this would be but I've certainly been wrong before   :)

     

     

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