Power Delivery Network (PDN) Design and Analysis to Achieve Low Impedance in Fast Edge Rate DC-DC Converters for EMI Compliance

This paper examines optimal design principles and practices essential for the printed circuit board (PCB) layout of switching regulators with fast dv/dt and di/dt edge rates to achieve electromagnetic interference (EMI) compliance standards. Reflections, crosstalk, and transmission line management techniques along with power delivery network/system (PDN/PDS) design are implemented for enhanced signal and power integrity. 4-layer board designed with embedded interplane capacitance, controlled impedance traces, proper signal termination and crosstalk management exhibits lowest noise emissions. The experimental results show good consistency with electromagnetic field theory and simulations. The paper also outlines effective design rules and practices essential for optimizing EMI/EMC performance and power integrity during the layout process of switching regulators in PCBs. By employing robust transmission line design techniques and power delivery system (PDS) design principles, a reliable PCB design for the DC/DC converter is achieved, ensuring compliance with EMI standards, and maintaining power integrity.