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EMI control is a complex design task that is highly dependent on many design elements. Like passive filters, active filters for conducted noise require careful layout and attention to grounding to ensure highest performance. This application note will describe how to use the QPI to solve noise problems with DC-DC converters. Recommended PCB layouts and suggestions for external components are made to help the user obtain the best performance of the QPI family.Measurement techniques and system level suggestions are also included.