https://devzone.nordicsemi.com/f/nordic-q-a/16589/nrf52-output-impedance-clarificationHi, I&#39;ve been digging through a lot of AN&#39;s about how to design a PCB antenna, in all of them an important parameter is the output impedance of the transmitter. So, according to this blog post, the output impedance of the nRF52 is not 50ohms, buten-USTelligent Community 13Thu, 22 Sep 2016 14:17:29 GMThttps://devzone.nordicsemi.com/thread/63469?ContentTypeID=1Thu, 22 Sep 2016 14:17:29 GMT137ad170-7792-4731-bb38-c0d22fbe4515:56750bdd-f576-48e7-ab6c-0df7de5d031eArturo Arellano Arciniega<p>Thanks, it is clear now.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/63468?ContentTypeID=1Thu, 22 Sep 2016 08:54:30 GMT137ad170-7792-4731-bb38-c0d22fbe4515:9cb4d26f-9222-4015-9352-5d0336e2629aEinar Thorsrud<p>The output impedance of the nRF52 is <em>not</em> 50 Ω, so <a href="https://devzone.nordicsemi.com/question/44555/recommended-chip-antenna-debugger-for-nrf52-based-design/?answer=44588#post-id-44588">this answer</a> is not correct. The correct answer would be that the output is unbalanced (due to the internal balun), but not matched. The external matching components are there for two main reasons: attenuate harmonics and match to 50 Ω. The <a href="https://devzone.nordicsemi.com/tutorials/35/">General PCB design guidelines for nRF52</a> describes layout considerations and matching in more detail.</p><div style="clear:both;"></div>