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What is the RF interference source of the RF connector?

Author: Date:6/9/2019 11:32:24 PM
 Today, electronic systems have clock frequencies of a few hundred megahertz, and the front and back edges of the pulses used are in the sub-nanosecond range. The network interface transmits data rates of 100 Mbit/s and 155 and 622 Mbit/s (ATM-Asynchronous Transfer Mode). High quality video circuits are also used for sub-nanosecond pixel rates. These higher processing speeds represent an ongoing challenge in engineering. 

Radio frequency (RF) interference is caused by rapid changes in electromagnetic energy. The oscillation rate on the circuit becomes faster (rise/fall time), the voltage/current amplitude becomes larger, and the problem becomes more. Therefore, solving electromagnetic compatibility (EMC) is even more difficult today than before.


Before the two nodes of the circuit, the rapidly changing pulse current represents a so-called differential mode noise source, and the electromagnetic field around the circuit can be coupled to other components and invade the connection. The inductive or capacitively coupled noise 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 "damaged circuit" or "recipient" and a loop (usually a backplane). Several factors are used to describe the size of the interference:


●The strength of the noise source

● Interference current around the size of the area

● rate of change


Thus, although there is a high probability of unwanted interference in the circuit, the noise is almost always co-modeled. Once the cable is plugged in between the input/output (I/O) connector and the chassis or ground plane, some RF voltages can cause a few milliamps of RF current to exceed the allowable emission level.