How should power supply beads and filter capacitors be used together in edge boxes?

The edge computing box uses a power supply bead and filter capacitor to form a low-pass filter network to suppress high-frequency power supply noise. When selecting the bead, pay attention to the DC resistance (DCR) and rated current. The IC's rated current should be dated by 80%. For example, if the chip current is 1A, select a bead with a DCR <0.1Ω. For beads with a DCR <1.2A, the model PBZ1608E600Z0T is recommended. The naming convention is PB bead Z (common 1608, size 1.6×0.8mm), E600 (impedance 60Ω), Z (tolerance 0), internal code T (packaging). The DCR should be 0.05Ω, rated current 2A. The filter capacitor value should be selected according to the noise frequency: 100kHz-1MHz uses 10-22μF MLCC, >1MHz uses 0.1μF MLCC. X7R material is recommended. A typical setup is a series bead with a 10μF + 0.1μF capacitor in parallel with the power input to ground to form a π-type filter. Multiple capacitors are also connected in parallel at the load to reduce ESL. Actual measurements show that the edge computing box CPU core power supply ripple decreased from 50mV to 8mV, and radiated emissions decreased by 12dB at 200MHz.