nrf54 antenna gnd

[Lucile CH]

Hello, 

In document nRF54L15_qfaa_4L_config1_pcb_reference_layout_0_6 there is a representation of the PCB with 4 layers. The GND of C9 is not connected on the top layer, nor on the inner layers, but only on the bottom layer using vias.
In document nRF54L15_caaa_config1_pcb_reference_layout_0_3 , ithere is an 8-layer representation: the GND of C9 is still not connected on the top layer, but it is connected to all the inner layers and to bottom.
For a 6-layer PCB, which configuration is correct? The one where only the top is connected to the bottom, or the one where the top is connected to all the layers?

Thanks in advance.

3146.nRF54L15_caaa_config1_pcb.pdfnRF54L15_qfaa_4L_config1_pcb.pdf

[JONATHAN LL]

Hi,

In short: Always use the latest reference design that is available on the product page. 

These are two different package types you are referencing, but the important thing here is to use the correct reference for the package type you use. 
For the QFN packages it is important that you follow and if possible copy the reference layout. 
https://docs.nordicsemi.com/bundle/ps_nrf54L15/page/chapters/ref_circuitry.html#ariaid-title4 
USe the connect on top to bottom solution here. 



For the CSP package types there is more freedom in how to do the layout for the RF matching components without it having negative impact on the performance. 
Here is the latest version for the CSP type


Regards,
Jonathan