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The constitutive relation for a nonlinear capacitor is
I = dQ/dt. Using the backward
Euler discretization scheme to discretize
dQ/dt one obtains
I 
= 

(2.37) 


G^{ . }V  
(2.38) 
G 
= 

(2.39) 
Equation (2.38) is a commonly used approximation
which, however, does not guarantee charge conservation [66,67]. For
constant C (2.38) of course simplifies to
(2.35). The stamp is given as
y_{x, y} 


f 
n_{1} 
G 
 G 
 I 
n_{2} 
 G 
G 
I 
Tibor Grasser
19990531