Simulate sine wave with timestep different than overall model timestep

Hello All,

I needed your help in understanding of where the mistake is and wanted to know how can I implement the following:

I have a simulink model running a certain fixed time step. And inside the model there is a sine wave function connected with a digital clock that is creating a sine wave with sample rate set to -1(inherit). Meaning it will use t=simulink model timestep. Instead of -1 I would like to use a time step which is faster than Simulink time step. I tried using different values but I am getting an error: "Digital Clock has an invalid sample time. Only constant (inf) or inherited (-1) sample times are allowed in the asynchronous subsystem".

Can you please suggest me what other options can I try?

Appreciate all your help and guidance.

Answer 1

[Umar]

Hi

Instead of a digital clock, you can create a MATLAB Function block that generates the desired sine wave at a faster rate which can be programmed by you to sample at your specified rate. Let me illustrate to you on how to implement a sine wave in a MATLAB Function block:

function y = fastSineWave(t)

    % Define the frequency and amplitude

    frequency = 1; % Hz

    amplitude = 1; 

    % Generate the sine wave

    y = amplitude * sin(2 * pi * frequency * t);

end

For more information on matlab function, please refer to

https://www.mathworks.com/help/simulink/slref/matlabfunction.html

Hope this helps. Please let me know if you have any further questions.