nRF7002 Isolated Metal Plane Question

[Cote9254]

Hello!

I am working to design and build a custom PCB using the nRF7002 chip and came across this callout on the schematic diagram and wanted some clarification about it. The PCB that I am working on is using a much more compact form factor than the reference diagram suggests so I would like to make sure any adaptation made with the custom board allows for full functionality of the chip.

1) Is there a distinct purpose to the solid metal plane in this suggested circuit? 

2)What is the effect on the functionality if it is changed?

3) If this component is used on a board with the nRF5340 or a similar device, will the entire panel require the solid plane or just the section under the nRF7002?

Thank You.

[Bendik Heiskel]

Hi,

The isolated part of the GND plane on L2 is for reducing noise from the buck converters and prevent it from spreading to other parts of the board.

This is the part of the ground plane being referred to:

3) If this component is used on a board with the nRF5340 or a similar device, will the entire panel require the solid plane or just the section under the nRF7002?

We recommend using the second layer as a GND plane, regardless of which SoC is being used. Traces can be routed on this plane as well, but the sections under the RF traces must be solid ground.

 

If you want more feedback on your design you can create a private ticket and share your schematic and layout files,  one of our HW engineers will give feedback on the design.

 

Best regards,

Bendik