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Mon Oct 27 11:20:20 EDT 2014

## Spice DC analysis, voltages sources and Thevenin equivalent circuit

In [1] it is mentioned that
- Current sources and resistors mix very well as they give simple
linear systems in terms of node voltages when Kirchhoff's Current Law
(KCL) is used for every node.
- The presence of a voltage source messes up this pretty picture. See
page 10 in [1].
I vaguely remember running into this in class, but thinking about it,
the statement "we cannot form the matrix equations" seems a bit hard
to believe. What exactly is the limitation? Surely there are 3
linear equations in 3 unknowns (I1, V2, V2) in Figure 2.
I guess the point is here that when all voltage sources are replaced
with current sources, the problem is a lot easier to state since all
node voltages are variables and for each node there is a KCL equation.
No need to keep track of which voltages are variables and which are
parameters.
[1] http://www3.imperial.ac.uk/pls/portallive/docs/1/7292571.PDF

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