The Development Trends of Common Mode Inductors 3

Common mode inductor technology route

There are currently two mainstream common mode inductor routes. One method is to sinter various materials such as ceramics, ferrites, and silver to form fine conductive electrodes inside, forming a multi-layer and multi coil winding structure, and improving indicators such as common mode impedance and differential mode loss. This technical solution is very suitable for high-speed differential signals such as USB 3.0, MIPI, and HDMI, because this inductance design can suppress common mode noise of 480MHz-2.4GHz by changing the coil design. Moreover, it adopts a high coupling design, which results in minimal loss in differential signals.

Another technological approach is to sinter materials such as non-magnetic ferrite and magnetic ferrite. Due to the characteristics of the raw materials, this solution can achieve a very small size and achieve a large common mode impedance. The formed common mode inductor is very reliable. This technological route is more suitable for suppressing the demand for low-speed broadband, such as USB 2.0 and MIPI-DPHY.  diode

Summary

In various applications with increasing data volume, high-frequency EMI problems in differential lines will become increasingly frequent. Common mode inductors are the best choice for solving high-frequency EMI problems in differential lines, with lower costs. The miniaturized and high-frequency common mode inductor can be widely used in differential line interfaces of various smart devices.diode