nrf21540 rf switch isolation

RE: nrf21540 rf switch isolation

Gabriel Chouinard — Tue, 11 Feb 2025 14:26:39 GMT

yes thank you!

RE: nrf21540 rf switch isolation

Elfving — Tue, 11 Feb 2025 13:29:03 GMT

It should be about ~37dB. Is that precise enough for you?

Regards,

Elfving

RE: nrf21540 rf switch isolation

Gabriel Chouinard — Thu, 06 Feb 2025 14:05:16 GMT

we are currently investigating a solution with an external antenna with a band pass filter to attenuate the 3rd harmonic of the FEM. We already measured a difference of about 10 dB when switching antenna and we only wanted to validate our measurements. So no it is not urgent.

RE: nrf21540 rf switch isolation

Elfving — Thu, 06 Feb 2025 13:46:33 GMT

You are right. I've forwarded the question to the relevant R&D team, I'll let you know once I hear from them. Is this request urgent for you?

Regards,

Elfving

RE: nrf21540 rf switch isolation

Gabriel Chouinard — Wed, 05 Feb 2025 19:11:19 GMT

unless I'm mistaken, the rf switch is part of the nrf21540. The nrf21540 it self should have a specification regarding the isolation of its antenna outputs.

RE: nrf21540 rf switch isolation

Elfving — Wed, 05 Feb 2025 10:10:27 GMT

Hi Gabriel,

I think this depends on the BL5340PA HW. We've only created the nRF, not the modules, so I think this might be a question that is better suited to be asked Ezurio. Let me know if they disagree, and I'll try to look into it.

Regards,

Elfving