Design guide on PCB layout from Micrel on 10/100 switches and PHY
This application note is intended to assist customers indesigning products that comply with both EMI and ESDstandards using Micrel’s 10/100 family of Ethernetproducts.The printed circuit board (PCB) is the single mostimportant factor that affects EMI, ESD and overallperformance. In order to meet these requirements dependon good design practices. The goal here is to minimizedigital and common mode noise as well as to provideshielding between the PCB’s internal circuitry and theexternal environment. These PCB design practices shouldapply to the entire PCB design, not just to Micrel Ethernetproducts.