Does the 400G chip in a data center switch increase radiation interference?

Data center switch 400G switching chips (such as 12.8T/25.6T) integrate hundreds of SerDes channels, operating at 56Gbps PAM4, with a base frequency of 2.8GHz and harmonics extending to over 30GHz, significantly increasing the risk of radiated interference. Actual measurements show that 400G chips raise the radiation floor by 8-12dB compared to 100G chip solutions in the 2GHz-6GHz frequency band. Suppression measures include: using arrayed magnetic beads (PBZ0402A-600Z0T, 60Ω@100MHz) for independent filtering on each chip power pin; ensuring a complete, undivided ground plane in the BGA area with ≥5 vias per power pad; and grounding the heatsink with a grounding impedance <10mΩ. After optimization, the measured radiation exceeds the FCC Part 15 Subpart B limit by >4dB.