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Curve-fitting capacitance data to a polynomial

Question asked by bclausen on May 21, 2003
This file gives an example of fitting GENESYS data
to a frequency-dependent capacitance using a
polynomial function.  You can use the concepts
in this workspace to create models.

This particular example is to model the open circuit
capacitance for an open circuit standard.  The goal is
to find a frequency-dependent equation for the capacitor
that fits the measured data "Cap_Data"

Just start the optimizer (Actions/Optimize) to watch the
fitting algorithm.

The equations to do this are as follows:

C0=?3
C1=?1e-3
C2=?7e-9
C3=?3e-12
F=freq
CEFF=C0+C1*F+C2*F^2+C3*F^3

!Find the difference between the capacitance model
! and the original data.
err=abs(linear1.sch1.rect[s11]-Cap_data.data.rect[s11])


err is then optimized to zero over the desired frequency range.

[file]port_calkit.wsp[/file]

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