Nowadays, with the continuous development of science and technology, many electronic devices have begun to need to use D-sub hybrid connectors. The use of connectors often produces a lot of electromagnetic interference. So, in our daily life, how can we effectively prevent and solve the electromagnetic interference of the connector? Today, let's tell you by Xiaobian!

The rapidly changing pulse current before the two nodes of the circuit represents the so-called differential mode noise source, and the electromagnetic field around the circuit can be coupled to other components and invade the connecting parts. Noise through inductive or capacitive coupling is common mode interference. The RF interference currents are identical to each other, and the system can be modeled as consisting of a noise source, a "victim circuit" or "recipient" and a loop (usually a backplane). Several factors are used to describe the size of the interference: the intensity of the noise source, the size of the area around the interference current, and the rate of change. Thus, although it is very possible to produce unwanted interference in the circuit, the noise is almost always comodel. Once the cable is connected between the input/output (I/O) connector and the housing or ground plane, certain RF voltages occur, resulting in a few milliamps of RF current sufficient to exceed the permitted emission level.

1. Set the decoupling capacitor close to the load.

2, the rapid change of the pulse current along the front and back, the loop size should be minimal.

3. Keep high-current devices (i.e. drivers and ASics) away from I/O ports.

4, Measure the integrity of the signal to ensure the minimum overshoot and undershoot, especially for the critical signal of high current (such as clock, bus).

5, the use of local filtering, such as RF ferrite, can absorb RF interference.

6, provide low impedance lapping to the base plate or the reference in the I/O area on the base plate.

For more information about D-sub hybrid connectors, you can log in to the official website of Xinrui Electronic Technology Co., Ltd. for more details!

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