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

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

Answer 1

[Joel Van Sickel]

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.

Regards,

Joel

[Kei]

Hi Joel,

Thanks for the reply and now i understand a bit more about the Matlab.

Kind regards

Kei Lam