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116 2. Tutorial
Then, we run NDAESolve sweeping the parameter V1 in the interval V V. Note that the
sweep variable can be any network parameter, for instance a voltage or current source parameter, a
model parameter, or even any unknown in the system of equations.
In[19]:= dctransfer = NDAESolve[staticequations, {V1, −0.5, 0.5}];
To display the DC-transfer curve graphically we again apply the function TransientPlot. For our
DC-transfer analysis we want to plot the output voltage V$5 versus the input voltage V1:
In[20]:= TransientPlot[dctransfer, {V$5[V1]}, {V1, −0.5, 0.5}]
12
10
8
6
V$5[V1]
4
2
-0.4 -0.2 0.2 0.4
V1
Out[20]= Graphics
The resulting plot shows the typical tanh-shaped transfer characteristic of this type of differential
amplifier.
Parametric Analyses
Finally, we demonstrate the usage of NDAESolve for carrying out parametric analyses. As an example,
we perform a parametric analysis of the above computed DC-transfer characteristic V$5[V1]. As
additional sweep parameter we choose the positive reference voltage VCC which shall take the values
VCC ∈ V V V. Note that for parametric analyses NDAESolve returns a multi-dimensional
data object (see Section 3.7.1).