Select EMI filter that are highly effective for removing noise at a carrier frequency causing interference.
If a normal-type ferrite bead is used, the carrier frequency impedance may be insufficient depending on the self-resonance frequency.
In that case, select a BLM-H series (for suppressing GHz band noise) or BLM-G series (for suppressing High-GHz band noise) ferrite bead with a high GHz band impedance.
Signals on the interface line to the LCD or camera module, which are likely to be a noise releasing source have become faster with an increase in data volume handled.
With this high-speeding of signals, the signal frequency and the noise frequency tend to come close to each other. To prevent degradation of the signal quality due to a loss of the harmonic component of signals by noise suppression parts, select EMI filter with a sharp impedance curve or insertion loss curve.