In multi-layer PCBs, inner layers provide vital features further than signal routing. Power planes and ground planes are devoted layers that present low-impedance power distribution and return paths, respectively. These planes offer you quite a few benefits: Telecom equipment, like satellites and base stations, normally use 6-layer PCBs to handle https://double-sidedtin-sprayedpo49372.blogthisbiz.com/37717554/5-simple-statements-about-hdi-arbitrary-interconnect-pcb-for-pico-projector-explained