Review of basic guidelines when designing mixed PCBs for SI and EMI

The present paper provides an introduction to the concepts and hints used to layout PCBs (Printed Circuit Boards) with good SI (Signal Integrity) and EMI (Electromagnetic Interference) control when designing RF (Radio Frequency), analog and digital electronic circuits, within the same PCB. This document also analyses the problem of getting good SI and EMI performance in dense populated PCBs with mixed technologies whenever interactions between technologies could not be avoided.