At what frequency is “impedance”, which is the representative feature of chip beads, prescribed?
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A. Impedance at 100MHz is generally prescribed.
Impedance at 1GHz is prescribed for the Gigaspira bead, which is also effective at high-frequency bands.
Furthermore, frequency ranges with noise suppression effects can be changed by selecting chip beads with different ferrite materials, even if impedance levels at 100MHz are equal.