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Below shows an RF switch(multiplexer):

enter image description here

So what I understand is that the same RF input is routed to multiple outputs. This can be I guess used to couple the same RF signal to many different equipment such as spectrum analyser, oscilloscope ect.

But lets say the scenario is such that we have many signals from several devices which we can couple these as inputs to a device under test's input. I tried to draw it as follows:

enter image description here

Now as in my above example, we can select which analog input will be coupled to the ADC. I named it as MUX.

So in such a case are RF switches used as well? Or only analog multiplexers are used? If RF multiplexer can also be used, what could be the reason? (is this called switch matrix?)

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You can regard the HMC252 as a multiplexer if you want: -

enter image description here

So in such a case are RF switches used as well?

No, you wouldn't use RF switches like the one above for regular low speed applications because regular low speed applications don't need inputs terminating in 50 ohms when disabled. Look at the picture above and note that when any of the 6 RF inputs are not used, those pins are internally connected to 50 ohms.

So what I understand is that the same RF input is routed to multiple outputs.

Or multiple RF inputs selectively coupled to a single output. They operate bidirectionally.

is this called switch matrix?

It's not an unreasonable description if produced by a marketing guy but I wouldn't use the word matrix because it's misleading technically.

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  • \$\begingroup\$ Great concise answer. \$\endgroup\$
    – floppy380
    May 26, 2020 at 12:58

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