RE: AoA RF switch - terminated/unterminated

Stetina — Thu, 30 Jul 2020 12:34:27 GMT

Yes, i see phase shift in static enviroment. Even in the middle of the garden, where there should be not much reflections.

Here is how the IQ data look like:

Here is the gif from data processing. Im able to compensate all data and don't see there any reflected signal.

https://gfycat.com/jealousremarkabledaddylonglegs

Legend from bottom:

-I,Q, I*Q from reference period

-phase from measuring slots

- after freq compensation

- median between antena switching (ant1 vs ant2 vs ant1....)

- arrow with phase sift from the center of measuring slot (3 samples: center sample+-1)

Our current RF switch in unterminated BGS13SN8E6327 without blocking caps.

RE: AoA RF switch - terminated/unterminated

Dmitry — Thu, 30 Jul 2020 09:55:08 GMT

Hi Hynek,

do you get different phase shift in static environment (no people walking near antennas)? Maybe you could show some IQ waves you got?

[quote userid="91720" url="~/f/nordic-q-a/64351/aoa-rf-switch---terminated-unterminated"]Also, there should not be any DC level, but someone form nordic recommended to use DC blocking cap:[/quote]

There will always be some DC level, if the switch IC requires blocking caps, you have to use them.