The theoretical analysis of the effect of space charge upon the “shot noise” in a planar diode shows that for practically all operating conditions, the tube noise is equivalent to the thermal resistance noise of the plate resistance at 0.644 times the cathode temperature. Noise in diodes of other than planar shapes is discussed and it is concluded that the same relation holds. It is shown that transit time produces the same high frequency modification for both the thermal and shot tube noise, and that the tube noise is decreased by transit time.
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Alexander Rack (1938) studied this question.
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