RF Toolbox™

timeresp - Calculate time response for model object

Syntax

[y,t] = timeresp(h,u,ts)

Description

[y,t] = timeresp(h,u,ts) computes the output signal, y, that the rfmodel object, h, produces in response to the given input signal, u.

The input h is the handle of a model object. ts is a positive scalar value that specifies the sample time of the input signal.

The output y is the output signal. RF Toolbox™ software computes the value of the signal at the time samples in the vector t using the following equation.

where

and A, C, D, and Delay are properties of the rfmodel.rational object, h.

Examples

The following example shows you how to compute the time response of the data stored in the file default.s2p by fitting a rational function model to the data and using the timeresp method to compute the time response of the model.

% Define the input signal
SampleTime = 2e-11;
OverSamplingFactor = 25;
TotalSampleNumber = 2^12;
InputTime = double((1:TotalSampleNumber)')*SampleTime;
InputSignal = sign(randn(1, ...
              ceil(TotalSampleNumber/OverSamplingFactor)));
InputSignal = repmat(InputSignal, [OverSamplingFactor, 1]);
InputSignal = InputSignal(:);

% Create a rational function model
orig_data=read(rfdata.data,'default.s2p');
freq=orig_data.Freq;
data=orig_data.S_Parameters(2,1,:);
fit_data=rationalfit(freq,data);

% Compute the time response
[y,t]=timeresp(fit_data,InputSignal,SampleTime);

See Also

smith

write