RE: Help evaluating nrf52840 schematic

Anders012 — Mon, 13 Apr 2026 12:55:06 GMT

Thank you so much for quick review. I will implement and post update for future reference.

ketiljo — Mon, 13 Apr 2026 12:00:49 GMT

1. These components needs to be close to the ANT pin:

Like this:

Note how C3 here is grounded only to the VSS_PA pin and the center pad.

2. No tracks under the RF section, only ground plane.

3. The VDD track on the bottom plane is creating a massive ground loop. Remove it from the ANT side of the chip.

4. Only ground under the 32 MHz crystal. Especially the DEC4/DEC6 track must be kept away from the crystal.