l/f Noise Sources

Abstract-This survey deals with l/f noise in homogeneous semiconductor samples. A distinction is made between mobility noise and number noise. It is shown that there always is mobility noise with an (Y value with a magnitude in the order of Damaging the crystal has a strong influence on cy, cy may increase by orders of magnitude. Some theoretical models are briefly discussed; none of them can explain all experimental results. The cy values of several semi-conductors are given. These values can be used in calculations of l/f noise in devices. inhomogeneous and often nonlinear devices. For the same reason, values obtained from devices are excluded from Fig. 5 at the end of this paper. nere we present reliable data, Obtained from homogenous Four types of noise are of importance in semiconductors. 1) Thermal noise. Any resistance R shows spontaneous current fluctuations or voltage fluctuations according to