Plane resonance at low frequencies (around 300MHz)
Narrow, long planes were identified to have resonance issues around the 250-350MHz frequencies: P1V8 (top), P12V (L5), M12V (L5), P3V3 (L5, the little tail that powers the DAC). Stitch with 3-4 100n 0402 caps along each plane. P5V0_RF and P1V8_VCCO have not popped up at the sim but judging from their shape they could also probably benefit from some caps at their edges. Weird though, these resonances are at like 1m and these structures are much much smaller than this. Mattia would try to double-check with some other tool.