Abstract :
After a brief survey of existing theoretical results, a detailed description of the simplified theory of space-charge smoothing of shot fluctuations in a diode, based on the Benham-Llewellyn theory, is presented. This is readily applied to the case in which the response is such that electron transit times are appreciable (i.e. in the V.H.F. range of response). Unlike the one reached formerly, the conclusion is that the ¿low-frequency¿ smoothing factor remains appreciably unchanged up to transit angles of approximately one radian. Application to the noise of grounded-grid triode circuits gives results which are in better agreement with experimental results in the V.H.F. range than are the results based on earlier theory. In conclusion, the effect on noise of a non-uniform field at the cathode of a triode is briefly discussed.
