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General PCB Design and Layout Guidelines

General PCB Design and Layout Guidelines

This application note is intended to assist customers in designing products that comply with both EMI and ESD standards using Micrel’s 10/100 family of Ethernet products.


The printed circuit board (PCB) is the single most important factor that affects EMI, ESD and overall performance. In order to meet these requirements depend on good design practices. The goal here is to minimize digital and common mode noise as well as to provide shielding between the PCB’s internal circuitry and the external environment. These PCB design practices should apply to the entire PCB design, not just to Micrel Ethernet products.