These are probably "lossy" ferrites that are used as EMI filters. High-frequency currents give rise to high-frequency magnetic fields. The ferrites are lossy at high frequencies. So the busbar looks like a resistor at high frequencies.I have seen the use of ferrite on the DC power rails on the FPGA boards. What is the purpose of using ferrite on the DC rails and how to select their values given the voltage and the maximum current is known.
+1These are probably "lossy" ferrites that are used as EMI filters. High-frequency currents give rise to high-frequency magnetic fields. The ferrites are lossy at high frequencies. So the busbar looks like a resistor at high frequencies.
Fig. 3 shows an example of the impedance frequency characteristics of a chip ferrite bead. The basic principle involved is as follows: The impedance increases in proportion as the frequency rises, as in the case of inductors, so by connecting these beads in series in a circuit, they function as a low-pass filter. With regular inductors, the main characteristic among the impedance (Z) values is the reactance component (X). On the other hand, since chip ferrite beads use ferrite materials with a high loss in the high frequencies, the main characteristic in the high-frequency range is the resistance component (R). The reactance component is not accompanied by loss, but the resistance component is. This means that, compared with regular inductors, chip ferrite beads have better properties for absorbing noise energy, providing a higher noise-suppression effect.
Hi,The permeability of ferrite is in the range of 1500 to 3000 where as the permeability of copper is close to 1. How do we compare the loop inductance and skin depth at low and high frequencies of these two materials.
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