ispassive

Return true if rationalfit output is passive at all frequencies

Syntax

result = ispassive(fit)

[result,maxfreq,maxvalue] = ispassive(fit)

Description

result = ispassive(fit) determines if the rational fit input, fit is passive at all frequencies (0,Inf).

[result,maxfreq,maxvalue] = ispassive(fit) determines if the rational fit input, fit is passive at all frequencies (0,Inf).

Examples

Check and Plot Passivity of N-by-N Rationalfit

Read the file, passive.s2p and fit the 2-by-2 S-parameters.

S = sparameters('passive.s2p');
fit = rationalfit(S);

Test the passivity of the 2-by-2 fit.

ispassive(fit)

ans = logical
   0

Plot the passivity of the 2-by-2 fit.

figure
passivity(fit,[1e9 40e9])

Input Arguments

fit — rfmodel.rational or rational objects returned by rationalfit function or rational object

N-by-N array

N-by-N array, specified as a a rfmodel.rational objects returned by rational or a rational object.

Output Arguments

result — Result of passivity test

true | false

Result of passivity test of the rfmodel.rational object, returned as true or false. The result tells you if the fit can result in unstable simulations.

maxfreq — Frequency at which norm(H) is equal to maximum value

scalar

Frequency at which norm(H) is equal to maximum value, returned as a scalar in hertz.

maxvalue — Maximum norm(H) over frequencies (0,Inf)

scalar

Maximum norm(H) over frequencies (0,Inf), returned as a scalar.