How to display different frequencies all at once onto the Spectrum Analyzer in Simulink?

Question

Kei 2022-8-8

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https://ww2.mathworks.cn/matlabcentral/answers/1775550-how-to-display-different-frequencies-all-at-once-onto-the-spectrum-analyzer-in-simulink

评论： Kei 2022-8-25

Testing_Different_Frequencies_V3.slx

Dear Sir,

I have trouble in displaying different frequencies, e.g: 10 to 20 GHz all at once onto the Spectrum Analyzer in Simulink.

I have attached my model, named: Testing_Different_Frequencies_V3 in this help request.

So please provide me with some suggestion/feedback in how i can display different frequencies all at once onto the Spectrum Analyzer in Simulink.

Thanks and regards

Kei Lam

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Answer 1

Joel Van Sickel 2022-8-8

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Hello Kei,

the first issue is how the sin is being generated. The blocks you are using package the sine output into frames, so it isn't a single signal, but actually a frame with 1024 data points. This isn't how the data can be formated for the blocks you have connected the sin waves to. I would start with the standard sine wave block for your first attempt. You can add a zero order hold to convert it to a fixed time step for the spectrum analyzer. I set the time step to 1/(20e9)/10, which is 10 samples per cycle of your fastest frequency. This step could be skipped if you set all three sin wave blocks to a fixed step, but I like to start with a continuous system.