Before revision: Switch mode power supplies include common and differential mode filtering inductors to block the switching signal noise returning into mains URL Common-mode rejection ratio is a measure of how well a circuit eliminates common-mode interference.
After revision: Switch mode power supplies include common and differential mode filtering inductors to block the switching signal noise returning into mains wiring.Understanding And Controlling Common-Mode Emissions In High-Power Electronics Common-mode rejection ratio is a measure of how well a circuit eliminates common-mode interference.