Abstract
The channel noise current spectral density of n-type enhancement SOS-MOS transistors versus the drain-source voltage VDs exhibits a peak not only for a floating bulk electrode but also when it is grounded. In the latter case, this peak appears at higher values of VDs. This suggests the kink effect which is now masked on the D.C. characteristics I D- V DS by a stronger multiplication. Theoretically we characterize this effect by means of an equivalent circuitry (electrical and noise) where the bulk electrode and the multiplication current generator associated with the drain space charge region are taken into account.