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ispassive

Return true if rationalfit output is passive at all frequencies

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Syntax

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

Description

example

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

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Open Live Script

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])

Figure contains an axes object. The axes object with title F i t blank n o t blank p a s s i v e , blank H indexOf infinity baseline blank n o r m blank i s blank 1 blank + blank 1 . 7 9 1 e - 0 2 blank a t blank 1 7 . 6 8 1 6 blank G H z . contains 4 objects of type line.

Input Arguments

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

Output Arguments

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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.

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

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

Version History

Introduced in R2010a

See Also

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