29 Feb '16, 9pm

READ: ADI’s Jefferson Eco & Aldrick Limjoco demystify ferrite beads: https://t.co/kj1HNJIJ6D

READ: ADI’s Jefferson Eco & Aldrick Limjoco demystify ferrite beads: https://t.co/kj1HNJIJ6D

Ferrite beads are categorized by three response regions: inductive, resistive, and capacitive. These regions can be determined by looking at a ZRX plot (shown in Figure 1b), where Z is the impedance, R is the resistance, and X is the reactance of the bead. To reduce high frequency noise, the bead must be in the resistive region; this is especially desirable for electromagnetic interference (EMI) filtering applications. The component acts like a resistor, which impedes the high frequency noise and dissipates it as heat. The resistive region occurs after the bead crossover frequency (X = R) and up to the point where the bead becomes capacitive. This capacitive point occurs at the frequency where the absolute value of capacitive reactance (–X) is equivalent to R.

Full article: http://www.analog.com/library/analogdialogue/archives/50-...

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