AN1131 Layout Guide - Silicon Labs

AN1131 : Design Guide for ReducingRadiated and Conducted Emissionsin Isolated Systems Using Skyworks IsolatorsSkyworks isolators are designed for minimal radiated and conduc-ted emissions, enabling systems to meet stringent standards suchas FCC Part 15, CISPR 32, and CISPR electronic circuits generate some level of radiated and conducted emissions. If theseemission levels are excessive, they may interfere with the operation of nearby or electri-cally connected equipment. Therefore, designers must be careful to minimize emissionlevels from their circuits to ensure the electromagnetic compatibility of their conducted and radiated emissions standards can be both challenging and cost-ly if not considered early in the design cycle. Component selection and printed circuitboard (PCB) design are key to reducing emissions and achieving first pass successfor a given standard s profile. This design Guide begins by identifying and classifyingsources of radiated and conducted emissions in an isolated system and then proposesvarious techniques to attenuate these emissions.

7.1 Adding Capacitance Between Power Domains. 23. 7.2 Using Common-Mode Chokes to Reduce Emissions. 25. 8. Controlling Emissions in Designs using Digital Isolators with Integrated DC-DC Controllers. 27. 8.1 Primary-Side Loop Currents. 28. 8.2 Secondary-side Loop Currents. 28. 8.3 Using Secondary-Side Snubber Circuit to Reduce Emissions Due to ...

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  Controller, Power, Layout

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