Patent ID: 8155934

Claim:
A method comprising: computer implemented modeling of linear properties of an electrical component having n >1 ports, whose linear properties are described in a matrix Y relating a voltage applied to the ports to a current through the ports, wherein a dependence of Y on an independent variable s is approximated by a model Y=F ( s, p 1 , . . . , p K ), [1.1] with p 1 , . . . , p K being parameters of the model and F being a matrix-valued function describing the dependence of Y on the variable s, said method comprising a passivation step of ensuring a passivity of said model by perturbing said parameters p 1 , . . . , p K to a perturbed set of parameters p 1 +Δp 1 , . . . , p K +Δp K while ensuring that the perturbed set of parameters fulfills a Boolean valued condition function C ( p 1 +Δp 1 , . . . , p K +Δp K )=true, [1.2] wherein said passivation step comprises the step of finding an approximate solution for the equations [ F ⁢ ( s , p 1 + Δ ⁢ ⁢ p 1 , … ⁢ , p K + Δ ⁢ ⁢ p K ) - F ⁡ ( s , p 1 , … ⁢ , p K ) ] · t i  λ i  ≅ 0 , [ 1.3 ] for i=1 . . . n, wherein t i and λ i are the eigenvectors and eigenvalues of matrix Y.