How to choose the type of signal line chip magnetic beads

     If SMD magnetic beads are used for signal lines, how to choose the type of magnetic beads? First of all, we should know that magnetic beads are used for signal lines, such as audio, video or others. This should know the operating frequency of the signal. In principle, the highest frequency of the magnetic beads should be at least higher than the effective bandwidth of the signal, otherwise it will affect the signal scale and thus affect the normal operation of the system. Even for compressed signals such as audio, because audio signals are usually decoded by audio decoders.      

  Therefore, even if it is a compressed audio signal, its EMI noise is usually as high as tens or even hundreds of MHz of high frequency noise. Second, the signal current must be known. For most signals, such as video, RS232, etc., it may be just a signal and there is not much current output, so it is usually unnecessary to consider the rated current of the chip beads. However, for audio signals, there is usually a power output. At this time, the selection of chip beads must consider the output current. At this time, how to convert the audio signal into an effective value to select the appropriate rated current magnetic beads.