Results of different methods of calculating the 1/f noise intensity of contacts are presented. Four models of constriction dominated contacts are considered each with one circular contact area. In two models the equipotential surfaces are oblate ellipsoids, the first model having an insulating hyperboloid boundary and the second an insulating plane boundary, with a contacting spot. The other two models have spherical zone equipotentials, one having a conic boundary, the other an insulating plane with a conducting spot.The last-mentioned model was calculated earlier by Hooge who used an approximation which we shall call the adding sheel approach. Our results of the calculation methods for the various models are compared with his simple results.
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