Inductance and magnetic beads with 0 ohm resistance

Magnetic Beads: composed of oxygen magnets, which convert AC signals into heat energy. They are energy conversion (consumption) devices and are mainly used in high-frequency circuits (high-frequency power entry or high-frequency signal lines) the high-frequency EMI noise interference is absorbed, and the effect of long and fine magnetic beads is better. You can concatenate multiple magnetic beads to increase the effect (more than 3 are ineffective )., Ferrite Magnetic Beads have obvious effect on noise signal rejection of more than 1 MHz. Therefore, they can be used for decoupling, filtering, and parasitic oscillation suppression of high-frequency circuits. It is particularly effective to eliminate the high-frequency noise interference caused by sudden changes of current caused by switching devices in the circuit and filter the power cord or other wires into the circuit. Ferrite Magnetic Beads can be divided into resistance and electrical sensibility.

The inductor is composed of a core and a coil. The function is to slowly release the AC signal storage, which is equivalent to the series of inductance and resistance. It is an energy storage component and is often used in a medium and low frequency filter circuit that does not exceed 50 MHz. The main parameters of Inductance are DC resistance (DCR, defined as the DC resistance of components without AC signal), rated current and low Q value. When used as a filter, the Wide Bandwidth feature is desired, so the high Q feature of the inductor is not required. The low DC resistance (DCR) can ensure the minimum voltage drop.

0 ohm resistance:

Directly Connecting a simulated ground to a digital ground will produce interference and will not work together (eventually all the ground will be connected together to form a unified 0 potential standard). At this time, magnetic beads and 0 ohm resistance may occur, among them, the magnetic beads need to know the noise frequency and only work for a certain frequency point, while the capacitive connection is easy to cause float. Otherwise, the zero ohm resistor must be used, and the current loop current must be limited in a narrow current loop (used between the ground plane segments at the same time, the shortest reflux path is cut off after the local segmentation)

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