Abstract
As the frequency of functional signals and interfering fields is rising beyond 1 GHz, the immunity of integrated circuits (ICs) against these higher frequencies is interesting. To design test setups that mimic the real-world interference an IC may receive, the dominant coupling mechanism (radiation or conduction) needs to be known. We hypothesize that the dominant coupling mechanism is conduction for small outline integrated circuit (SOIC) packages up to about 10 GHz. To challenge this hypothesis, the radiated immunity of a printed circuit board trace connected to a voltage regulator IC is predicted and measured. The radiated immunity is predicted to be the product of the field-to-trace attenuation and the conducted immunity of the IC, thus neglecting the radiated immunity of the IC. As far as could be measured, the prediction correlated well with measurement, so the dominant-conduction hypothesis was not falsified with this case study.
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