资料介绍
pcb design guideEMC DESIGN GUIDE
HENRY OTT CONSULTANTS
PCB DESIGN GUIDELINES Guidelines for the design and layout of high-speed digital logic PCBs. Give a lot of consideration to component placement and orientation. Avoid overlapping clock harmonics. Make a harmonic table for each clock. Clock signal loop area must be kept as small as possible. Get paranoid about clocks! Use multilayer boards with power & ground planes whenever possible. All high frequency signal traces must be on layers adjacent to a plane. Keep signal layers as close to the adjacent plane layer as possible (< 10 mils). Above 25 MHz PCB's should have two (or more) ground planes. When power & ground planes are on adjacent layers, the power plane should be recessed from the edge of the ground plane by a dista