Timeline for Purpose of high resistance ferrite beads?
Current License: CC BY-SA 4.0
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| Jul 21, 2021 at 11:52 | comment | added | Neil_UK | @tobalt Not the correct interpretation. All beads are inductor-like at low frequencies. All beads get lossy and essentially resistive at high frequencies. If a high impedance is what you're after, then the higher peak impedances are only available over a narrower frequency range. This is nothing to do with an LC resonance. If you are outside the 'good' frequency range, then you get a lower impedance resistive-looking loss. | |
| Jul 21, 2021 at 11:29 | comment | added | tobalt | Thank you for the answer. That last paragraph seems to indicate that a bead's characteristic indeed becomes gradually more inductor-like the higher its nominal peak impedance. When an LC resonance frequency then falls slightly out of its high impedance range, (which happens more easily because of the narrow frequency range) one gets ringing. In that case a lower impedance but wider range bead can attenuate better but when the frequency matches, the higher impedance bead attenuates better ? | |
| Jul 21, 2021 at 11:14 | history | answered | Neil_UK | CC BY-SA 4.0 |