passivity

Plot passivity of N-by-N rational fit output

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Syntax

passivity(fit)
passivity(fit,xlimits)
[maxfreq,maxvalue,freqs,ns] = passivity(fit)

Description

passivity(fit) plots the passivity of the input, fit, over a range of frequencies. Passivity is evaluated by calculating the two-norm of the fitted response across frequencies. A model is considered passive if the maximum two-norm value observed over all frequencies is less than or equal to one.

example

passivity(fit,xlimits) plots the passivity with X-axis limits of the plot.

[maxfreq,maxvalue,freqs,ns] = passivity(fit) returns the data that is used to generate the plot.

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 Fit not passive, max norm(H) is 1+1.79e-02 at 17.7 GHz, xlabel Frequency (GHz), ylabel norm(H) contains 4 objects of type line. One or more of the lines displays its values using only markers

Input Arguments

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Rational fit of S-parameters of passive elements, specified as an N-by-N array of rational or rationalfit object.

Data Types: double

X-axis limits of the plot, specified as a 1-by-2 vector.

Data Types: double

Output Arguments

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

Data Types: double

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

Data Types: double

Calculated two-norm at each frequency of the S-parameters matrix, returned as a column vector.

Data Types: double

Frequency values, returned as a column vector.

Data Types: double

Version History

Introduced in R2019a

See Also

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