Hi Oğuzhan,
we of course haven't run any matching tests on what happens in that bypass mode; it would
still seem to me that if you bypass U805, you'd want to remove the in- and output
capacitors, indeed. I'd strongly advise against doing this modification, for the following
technical reason:
24 to 27 dB isolation is indeed what the datasheet of the SKY13335-381LF says, but don't
forget that you have another 24 to 27 dB of isolation between TX and RX in U807, adding up
to 48 to 54 dB of isolation. That's in the same ballpark as crosstalk through the board,
power supply, adjacent traces etc. The B2xx was designed by RF engineers who kind of knew
what they were doing :D
So, don't expect to win much by removing U805. Especially paired with the fact that we
have no characterization of matching in the bypassed mode, I'd assume you really won't end
with a cleaner RX, but just more problems
Best,
Marcus
On 18.09.23 08:11, ouzan...@hotmail.com wrote:
Hello, in my case, the function performed by the "SKY13335−381LF" IC switch is not
working for me. And as far as I can see, the isolation of this component is low
(24dB-27dB). The card I have is B200. Schematic B210 given in the link
"https://files.ettus.com/schematics/b200/b210.pdf";. I want to bypass this component. As
far as I can see, there are pads for this on the card. I think it is bypassed by
activating C847 and C849 in the relevant part of the B210 schematic that I sent you in
attachment.
The main question I want to ask is, should I connect the 220pF capacity seen in C810 to
C847, and the 470pF capacity seen in C814 to C849? Or should I short circuit directly?
I am aware of all the risks. I'll be happy if you can help me. Have a nice day.
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