Superheterodyne Receiver Using RF Budget Analyzer App

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Hanxiang Zhang
Hanxiang Zhang 2020-5-13
评论： Mehmed Saad 2020-5-14
Hello, I am trying to use RF Budget Analyzer App to do some budget analysis, before that I try to rerealize the example shown in the link below:
https://www.mathworks.com/help/rf/examples/superheterodyne-receiver-using-rf-budget-analyzer-app.html
However, I got couple questions about that, hope anyone got ideas or intuitions can help me out, Thanks!
1). The input signal setup signal bandwidth = 20MHz, then RF filter bandpass = 20MHz (which makes sense), but bandpass for IF filter is 5MHz, how to understand that? Is the parameters wrong or some points I didn't get.
2). I tried to change the bandpass for both RF filter and IF filter, but these changes didn't change the budget result at all. Only signal bandwidth input at the beginning of budget link affacts the results (mainly SNR). I can undersand the SNR changes because of reduce of noise power bandwidth, but how could bandpass of filter not affecting the results?
Again, hope anyone having ideas can give me some clues.
Thank you!
ZHX

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回答（1 个）

Mehmed Saad
Mehmed Saad 2020-5-13
The paper implemented in example is
https://ieeexplore.ieee.org/document/5688819
see Table II of paper (you can also view it here)
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Hanxiang Zhang
Hanxiang Zhang 2020-5-14
Yes, I just found it today that paper states the occupied BW is < 5MHz. And I was misled by the explanation on Mathswork that the note "Signal bandwidth = 20MHz". Thanks again!
By the way, how should understand the saying that "receiving Bandwidth" in the paper? Is this the band width that going through the RF filter and only used to calculate the noise source power at the beginning of the link?

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