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Analysis of signal integrity/power integrity in multilayer printed circuit board and two improving methods

The signal integrity (SI) and power integrity (PI) in multilayer printed circuit board is analyzed using three-dimensional (3D) full EM simulation and the circuit simulation. As a result of that, the dominant factor of SI/PI on the test board is noise coupling by GND via. Hence, two methods are applied to suppress the coupling; differential signaling and anti-via structure. Using these two methods, the noise on the signal line and power via can be suppressed, remarkably. Therefore, the SI/PI in multilayer PCB can be guaranteed to the low noise level.