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SParameterChannel

Convert S-parameter to impulse response

Description

The SParameterChannel object combines the scattering parameter (S-parameter) model of a baseband communication channel with an analog transmitter and receiver into a single S-parameter with adjustable port ordering. The object then calculates the impulse response of the S-Parameter using the rational (RF Toolbox) function. The SParameterChannel object supports .sNp Touchstone files, where N represents the number of ports.

Creation

Description

obj = SParameterChannel(filename) creates an S-parameter channel object obj by importing data from the Touchstone file specified by filename.

Input Arguments

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Touchstone 1.0 data file that contains network parameter data, specified as a character vector or string scalar. filename can be the name of a file on the MATLAB® path or the full path to a file.

Note

The data file must be formatted as a Touchstone 1.0 file. Touchstone 2.0 is not supported.

Properties

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The name of the Touchstone data file from where you want to import the S-parameter data, specified as a character vector or string scalar.

Data Types: char | string

Port order for the S-parameter, specified as a character vector. If left blank, the function automatically detects the through paths and the re-orders the ports in the order [in1 out1 in2 out2].

Example: [1 2 3 4]

Data Types: char

Maximum number of poles to use to fit a rational model, specified as a positive scalar integer.

Data Types: double

Desired error tolerance for rational model fit, specified as a real scalar in dB.

Data Types: double

Sample interval of the impulse response, specified as a positive real scalar in seconds.

Data Types: double

Desired duration of the impulse response, specified as a positive real scalar in seconds. The total number of samples in the impulse response is calculated by dividing the StopTime property by SampleInterval property.

Data Types: double

Single-ended impedance of the transmitter analog model, specified as a nonnegative real scalar in ohms.

Data Types: double

Capacitance of the transmitter analog model, specified as a nonnegative real scalar in farads.

Data Types: double

Amplitude of the stimulus input to the transmitter analog model, specified as a real scalar.

Data Types: double

20%–80% rise time of the stimulus input to the transmitter analog model, specified as a positive real scalar in seconds.

Data Types: double

Single-ended impedance of the receiver analog model, specified as a nonnegative real scalar in ohms.

Data Types: double

Single-ended impedance of the receiver analog model, specified as a nonnegative real scalar in ohms.

Data Types: double

This property is read-only.

Port order used for the S-parameter channel analysis, returned as a vector. If you do not define the port order using PortOrder property, the through paths are automatically detected and reported here.

Data Types: double

This property is read-only.

Impulse response of the system defined by the S-parameter channel object, returned as a vector.

Data Types: double

This property is read-only.

Time vector corresponding to the system impulse responses, returned as a vector.

Data Types: double

This property is read-only.

S-parameter frequencies, specified as a positive real-valued vector. The frequencies are sorted from the smallest to the largest value.

Data Types: double

This property is read-only.

Transfer function of the system defined by the S-parameter channel object, returned as a vector.

Data Types: double

This property is read-only.

Output statistics from rational (RF Toolbox), returned as an object.

Data Types: double

This property is read-only.

Uncertainty due to rise time discretization, returned as a negative real scalar.

Data Types: double

Examples

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Create an S-parameter channel object.

obj = SParameterChannel('FileName','default.s4p');

Extract the time vectors and impulse responses.

t = obj.t;
impulse = obj.ImpulseResponse;

Plot the impulse response.

plot(t,impulse);

Figure contains an axes object. The axes object contains an object of type line.

Introduced in R2021a