https://devzone.nordicsemi.com/f/nordic-q-a/128679/nrf52840-output-powerA customer implemented a nRF52840 (QIAA package) and says the output power is about 10dB lower than expected. Having done multiple nRF52 designs with good results, I reviewed their schematic and layout and observed that it generally looks pretty gooden-USTelligent Community 13Mon, 13 Jul 2026 08:57:57 GMThttps://devzone.nordicsemi.com/thread/569033?ContentTypeID=1Mon, 13 Jul 2026 08:57:57 GMT137ad170-7792-4731-bb38-c0d22fbe4515:68805af4-1e1e-402d-808a-c1ed133e3e7cPriyanka<p>Hi Kevin,</p> <p>For Normal voltage operation, the VDDH needs to be connected to the same 3.3V supply as VDD.</p> <p>Leaving VDDH unconnected or floating while in Normal voltage mode is not a supported configuration.</p> <p>I would suggest them to try this first, though this issue alone should not actually cause a 10dB reduction in output power.</p> <p>If even after connecting VDDH and VDD they are facing this issue, then please check the software side, i.e. whether the radio is properly configured for the transmit power.</p> <p>And they could also check the antenna and the matching network, whether it follows the reference design and also complies with the antenna manufacturer&#39;s recommendations (this can be checked from the antenna&#39;s datasheet).</p> <p>-Priyanka</p><div style="clear:both;"></div>