An electromagnetic crystal power substrate with efficient suppression of power/ground plane noise on high-speed circuits

摘要

An electromagnetic crystal power substrate (ECPS) in a high-speed circuit package is proposed for suppressing the power/ground planes noise (P/GPN) and the corresponding electromagnetic interference (EMI). The ECPS is simply realized by periodically embedding the high dielectric-constant rods into the conventional package substrate between the continuous power and ground planes. With a small number of embedded rods and low rod filling ratio, the proposed ECPS design can efficiently eliminate the noise of 30dB in average within several designed stopbands. In addition, the radiation or EMI resulting from the P/GPN is also significantly reduced over 25dB in the stopbands. The excellent noise and EMI suppression performance for the proposed structure are verified both experimentally and numerically. Reasonably good consistency is seen.