https://devzone.nordicsemi.com/f/nordic-q-a/124369/nrf52840-balunI am using a QFN73 pin package of nRF52840. The data sheet says it has built in balun. So if I follow the reference circuit, where do I see 50 ohm looking int to the chip, right at pin ANT or after the pi network C3-L1-C4?en-USTelligent Community 13Mon, 15 Sep 2025 14:39:02 GMThttps://devzone.nordicsemi.com/thread/548773?ContentTypeID=1Mon, 15 Sep 2025 14:39:02 GMT137ad170-7792-4731-bb38-c0d22fbe4515:6f5b17cc-a76b-4ad0-99b3-7daf94f5aa62mathiaso<p>Hi.</p> <p>The 50-ohm reference point would be after the matching network. This is referred to as &quot;point B&quot; under &quot;RF path&quot; -&gt; &quot;Matching the radio to 50 ohms&quot; in <a href="https://devzone.nordicsemi.com/guides/hardware-design-test-and-measuring/b/nrf5x/posts/general-pcb-design-guidelines-for-nrf52-series">this guide</a>. The example from the nRF52840 with the four-component matching network found in <a href="https://docs.nordicsemi.com/bundle/ps_nrf52840/page/ref_circuitry.html#ariaid-title8">circuit config. no. 7</a> is found below.&nbsp;<br /><img style="max-height:240px;max-width:320px;" src="https://devzone.nordicsemi.com/resized-image/__size/640x480/__key/communityserver-discussions-components-files/4/pastedimage1757947004883v1.png" alt=" " />&nbsp;</p> <p>Best regards,<br />Mathias</p><div style="clear:both;"></div>