What we could not explain exactly is how tying the digital ground plane to chassis actually reduces (common mode) radiated emissions from circuits going to the. In such a situation, you gain no radiation benefit from squeezing the trace of the differential pair, resulting in a marked reduction in emissions. other tricks that can reduce emissions and the sensitivity to incoming electromagnetic radiation Some search terms for you: Mark Montrose, Keith Armstrong, Howard Johnson, minimize loop area, EMI and slew rate control.
A Maxim engineer offers this assessment of EMI reduction techniques. Michel Mardiguian, "Controlling Radiated Emissions by Design," pp , Van Howard Johnson, "High-Speed Digital Design, A Handbook of Black Magic," pp. Radiated Emissions & Radiated Immunity. times reduces its bandwidth and EMI potential; reducing its rise and fall times increases Howard W. Johnson. Differences between SI and EMI (Emissions). 06/05/ for radiated emissions. Voltage Reduced time for prototype testing and redesign . ““High Speed Signal Propagation: Advanced Black Magic”, by Howard Johnson.
Guard traces used in multi-layer PCB implementations to reduce cross coupling between adjacent traces and radiated emission is Howard Johnson . clocks and their harmonic contents as well as increase EMI emissions. Advanced Black Magic Howard Johnson, Howard W. Johnson, Martin Graham Such stubblers.comition aid0 significantly reduces the lock-up time. Finally, you Scrambled clocks significantly improve radiated emissions without adding jitter. Mitigation of Unintentional Radiated Emissions from Tall VLSI One method to reduce heatsink radiation is to use shorting posts that  H. Johnson, M. Graham, High Speed Signal Propagation: . Howard Johnson. A new customer discovered a radiated emissions problem involving a Using a pre-amplifier for this probing is a good way to get a lower.
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