https://devzone.nordicsemi.com/f/nordic-q-a/117328/nrf54l15-impedance-matching-networkHello, I am designing a PCB using the nRF54L15 and a ceramic antenna and got confused regarding the impedance-matching network. In the detasheet a 1.5pF, 2.0pF, and 0.3pF capacitors and 2.7nH and 3.5nH inductors are used, but in the DK schematics anen-USTelligent Community 13Mon, 16 Dec 2024 15:54:07 GMThttps://devzone.nordicsemi.com/thread/515174?ContentTypeID=1Mon, 16 Dec 2024 15:54:07 GMT137ad170-7792-4731-bb38-c0d22fbe4515:d5a3d5ca-fccd-46a3-8367-606f60ca6947ketiljo<p>Only C6 is grounded to the bottom layer. All other components are grounded on the top layer ground plane as usual&nbsp;</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/515104?ContentTypeID=1Mon, 16 Dec 2024 13:03:39 GMT137ad170-7792-4731-bb38-c0d22fbe4515:8fe7378b-0f63-4cab-a5b4-3f3a3eaaf8d4ael-mess<p>Ok, thank you for your response.</p> <p>So if required, the tuning components need to be after C11, but should also the tuning components not be grounded in the top layer?</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/515096?ContentTypeID=1Mon, 16 Dec 2024 12:53:12 GMT137ad170-7792-4731-bb38-c0d22fbe4515:a5bd8fba-bcfb-423c-8847-54faaa588203ketiljo<p>This is the latest reference design for the nRF54L15 QFAA&nbsp;</p> <p><img style="max-height:240px;max-width:320px;" src="https://devzone.nordicsemi.com/resized-image/__size/640x480/__key/communityserver-discussions-components-files/4/pastedimage1734353463572v1.png" alt=" " /></p> <p>The 1.4 pF cap you see on the DK is for antenna tuning. In your case, you want to place all antenna tuning components between C11 and the antenna.&nbsp;</p> <p>The DK may be older than the reference design. DKs version 0.9.2 and later will have the updated reference design.&nbsp;</p><div style="clear:both;"></div>