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2.10 Nonlinear Symbolic Approximation 173
In[14]:= Plot3D[ivload[VLOAD, II],
{VLOAD, 0., 3.5}, {II, 0., 0.001},
AxesLabel −> {"VLOAD", "II", ""},
PlotLabel −> "IVLOAD (Analog Insydes)"]
IVLOAD (Analog Insydes)
0.0003
0.0002
0.0001
0
1
VLOAD
2
3
0
0.001
0.0008
0.0006
0.0004
II
0.0002
Out[14]= SurfaceGraphics
Model Validation
One key step is now to check if the numerical simulation in Analog Insydes is identical to the result
of the PSpice simulation, i.e. to check if we have chosen appropriate transistor models. This can for
example be done by comparing the graphical output. We choose some arbitrary value for VLOAD and
plot both output values in one graph sweeping II. The plot shows that both curves are identical
(for this value of VLOAD). Alternatively, we can calculate the maximum difference of both output
values evaluated on a uniform grid. The result shows that the deviation is of order ΜA.
In[15]:= TransientPlot[{ivloadPSpice[2., II], ivload[2., II]},
{II, 0., 0.001}]
0.0003
0.00025
0.0002
0.00015
0.0001
0.00005
0.00020.00040.00060.0008 0.001 II
ivloadPSpice[2., II]
ivload[2., II]
Out[15]= Graphics