Following on the previous article, here we’ll zero in on more tried-and-true electromagnetic-interference (EMI) reduction techniques for circuit and package designs that will help electrical/electronic designers pass EMI testing standards.
Dual Random Spread Spectrum (DRSS)
Dithering or spread-spectrum techniques have been used in radio and wired communications in the past. Switching power supplies, switching converters, and switch mode controllers all typically employ dual random spread spectrum (DRSS),1 a fairly new technique, to reduce EMI generated by switchers (for more, go here).