US Patent 7746123 Switching system with reduced EMI

Various apparatuses, methods and systems for switched mode electronic circuits with reduced EMI are disclosed herein. For example, some embodiments of the present invention provide apparatuses including a power supply, an output, and a composite switch connected between the power supply and the output. The composite switch includes a plurality of transistors connected in parallel, a switch closing delay line having a plurality of switch closing outputs each connected to a control input of one of the plurality of transistors, and a switch opening delay line having a plurality of switch opening outputs each connected to one of the plurality of switch closing outputs. The switch closing delay line and switch opening delay line are connected in an order that opens the plurality of transistors in a staggered order in time and closes the plurality of transistors in a reverse staggered order in time.