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Senior
August 27, 2025
Solved

Determining output power from the ST25R3916

  • August 27, 2025
  • 2 replies
  • 290 views

Is there a way to find the RF output power using the ST25R3916 without measuring it externally? I don't need an exact value. 

The product selector says the nominal output power is 1600 mW. However, at a max of 3 Vpp and 150 mA input current (measured via power profiler), that's 450 mW not including losses. I know that the output power can be adjusted via the d_res register, which I do, but that's only to aim for the target amplitude. Is there something else I can look at here?

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Best answer by Ulysses HERNIOSUS

Hi,

output power needs to be measured externally.

BR, Ulysses

2 replies

Ulysses HERNIOSUS
Technical Moderator
August 28, 2025

Hi,

output power needs to be measured externally.

BR, Ulysses

LltWcAuthor
Senior
August 28, 2025

Got it, thanks