Analysis of radiation noise caused by power distribution on multilayer printed circuit board

This paper investigates the cause of radiated noise from power and ground fluctuations in the feed system, and presents an evaluation method and a simple approximate model. Radiated noise from the feed system has two causes: (1) resonance phenomena (cavity resonance) due to power and ground planes on a printed board; and (2) resonance due to the IC lead frame, IC capacitance, and output-signal load. The resonance frequencies in these two cases can be determined by measuring S11-parameters from the IC power and ground pins.