Reducing SoC electromagnetic emissions by design

This paper deals with the design of power supply distribution network in CMOS System-on-Chips to reduce electromagnetic emissions. The main sources of both conducted and radiated emissions are pointed out and the most popular solutions for these problems are summarized. Based on that, the paper shows a new power supply network and grounding scheme that strongly mitigate the off-chip propagation of core circuit interference that gives rise to electromagnetic emissions. The proposed power supply circuit can be implemented as a simple redesign of conventional power supply circuit without any modification to the logic design flow.