EMI control technology of digital circuit PCB

Along with the integration of IC devices increase, the progressive miniaturization of devices and device speed higher, EMI in electronic products is more serious. From the point of view of system EMC/EMI design, PCB design phase deals with the problem of EMC/EMI in equipment, is bringing the system to EMC standards the most efficient, lowest-cost method. This EMI control technology in digital circuit PCB design.

First, EMI and suppression principle

EMI is due to electromagnetic sources of interference coupling paths to transfer energy to sensitive systems. It includes via wire or the common ground of conduction, radiation through space or through near-field coupling three basic forms. EMI hazard to reduce the transmission of the signal quality, even damage to the circuit or device, the equipment does not meet standard technical requirements on electromagnetic compatibility.