nRF21540 with no load

RE: nRF21540 with no load

Hieu — Tue, 14 Oct 2025 17:30:52 GMT

Hi Rashid,

I double checked with my colleague, and it's not just RX sensitivity, but both TX and RX performance need to be compromised, by adding an attenuator between the FEM and the antenna. I must stress that this is not a good solution though, as it is just wasting power/.

Best regards,

Hieu

RE: nRF21540 with no load

Rashid Talib — Fri, 10 Oct 2025 17:16:54 GMT

Hi Hieu
Thanks for your reply. If RX sensitivity could be compromised, what solutions would you suggest?

Best regards
Rashid

RE: nRF21540 with no load

Hieu — Thu, 09 Oct 2025 21:41:39 GMT

Hi Rashid,

After some internal inquiries, we concluded that there is risk of damaging the FEM if it is run unloaded for an extended period of time.

There is unfortunately no way to protect against this without sacrificing RX sensitivity.

Perhaps it's best to make sufficiently clear warning against this misuse?

Best regards,

Hieu

RE: nRF21540 with no load

Hieu — Fri, 03 Oct 2025 12:52:30 GMT

Hi Rashid,

I will look into this and follow-up with you next week.

Best regards,

Hieu