The influence of extruded-finned heatsink on noise susceptibility of IC; the case of capacitive coupling

This study describes the simulated and experimental results about the influence of an extruded-finned heatsink on the noise susceptibility of an IC. It is concluded that the simulated results by FEM and authors' proposed approximation method to reduce computation time are in good agreement with the experimental results within 2 dB, and the noise susceptibility of the IC increases (immunity degrades) by equipping a heatsink, except susceptibility is down in the resonant frequency of the circuits.