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The constitutive relation for an ideal current source is given as I = I_{0}(t). The current can be
arbitrarily timedependent and several common curve shapes have been
implemented. However, no dependence on solution variables is allowed as this
would result in a voltage or current controlled source (see Section 2.3.3.8
and Section 2.3.3.9). The stamp is given as
y_{x, y} 


f 
n_{1} 


I 
n_{2} 


 I 
The sign of the current is different as compared to the passive elements as it
is defined to flow out of the source. Generalizing the branch relation
to
I = I_{0}(t)  V^{ . }G, that is to a current source with shunt resistance,
gives the following stamp
y_{x, y} 


f 
n_{1} 
G 
 G 
I 
n_{2} 
 G 
G 
 I 
which is of course the superposition of an ideal current source with an
ideal conductor.
Next: 2.3.3.7 Voltage Source
Up: 2.3.3 Devices
Previous: 2.3.3.5 Linear Inductor
Tibor Grasser
19990531