https://devzone.nordicsemi.com/f/nordic-q-a/87066/6-layer-stackupsHi, I am after some assistance with creating a 6 layer stackup to use with the NRF52840_CIAA that is 1.6mm thick. Can you provide recommend layer stack up that have been used with this IC that meets our requirementsen-USTelligent Community 13Wed, 20 Apr 2022 08:01:26 GMThttps://devzone.nordicsemi.com/thread/363785?ContentTypeID=1Wed, 20 Apr 2022 08:01:26 GMT137ad170-7792-4731-bb38-c0d22fbe4515:bcf59425-9552-4da6-ace0-f7f5a15f0115Kaja<p>Hi,<br /><br />the layer stack recommendation is the same for four or six layers, the nRF on the top or bottom layer,&nbsp;o<span>n PCBs with more than two layers, put a keep-out area on the inner layers directly below the antenna matching circuitry (components between device pin ANT and the antenna) to reduce the stray capacitances that influence RF performance. But add ground under the RF path, to create an RF shield on the bottom/top layer, opposite of the nRF. See the&nbsp;<a href="https://infocenter.nordicsemi.com/topic/ps_nrf52840/ref_circuitry.html?cp=4_0_0_6_2_15#layout">pcb example. </a></span></p> <p><span></span></p> <p><span>Best regards,<br />Kaja</span></p><div style="clear:both;"></div>