Power layout designMicro-Star Advanced Technology Dept. Simulation Section Monica Chang Power plane noise comes from …? PI simulation RGB signal simulation Signal reference power or GND plane PWM checklist Real example Failure to correctly control the signal and its return path will lead to reduce system performance, increased noise and high electromagnetic emissions. Return current have close relationship with return current loop area ->loop L reference plane layout ->area, shape, Is it a complete path or not? via transitions -> board level resonance connectors -> It increase return current loop, and cause imperfect reference plane PCB stack-up -> It may increase or decrease return current loop Microstrip line return current characteristic 1. Current distribution on the reference plane I0 1 I(……