RE: RF layout on aQFN73 with minimal pad to track spacing 0.2mm

Andreas — Mon, 16 Nov 2020 10:07:05 GMT

Hi,

If this is not possible, you will just have to ground C43 like 'normal'; connect it to the ground pour+via to the south, and try to see if you can fit a via between the NETC43_2 and DEC4_2:

The radio will still work, but you should expect having to tune the RF matching network components in order to get sufficient harmonic attenuation and good TX output power. We can assist with this if needed. Worst-case you will have to back off on output power a bit to get the harmonics down.

One recommendation could be to add another series inductor in the matching network, this is generally possitive for harmonic attenuation. See for reference the matching network in reference circuitry of nRF52833:

Best regards,
Andreas