DocumentCode :
1278654
Title :
Fluctuation noise in vacuum tubes which are not temperature-limited
Author :
Williams, F.C.
Volume :
78
Issue :
471
fYear :
1936
fDate :
3/1/1936 12:00:00 AM
Firstpage :
326
Lastpage :
332
Abstract :
This paper is concerned chiefly with a discussion of whether or not the anode stream of a thermionic valve produces a component of fluctuation voltage equal to that which would be produced by a metallic conductor of equal resistance at the cathode temperature. In a recent paper, G. L. Pearson has shown that when the anode current is very small, the fluctuation voltage is equal to that in a metallic conductor of equal resistance at a temperature about half that of the cathode. In this paper it is shown that when the anode current is very small a familiar expression for the shot voltage assumes a form suggestive of a thermal-agitation voltage in a resistance at half the cathode temperature. This form is due to the dependence of anode current on cathode temperature when the anode is negative. Thus it would seem that Pearson´s work does not necessarily prove that the anode stream is the seat of a thermal-agitation voltage: his results can equally well be interpreted as a shot-voltage effect, and such interpretation gives a direct explanation of why the relevant temperature is only half that of the cathode.
Keywords :
electron tubes; fluctuations; noise; thermionics;
fLanguage :
English
Journal_Title :
Electrical Engineers, Journal of the Institution of
Publisher :
iet
Type :
jour
DOI :
10.1049/jiee-1.1936.0052
Filename :
5317045
Link To Document :
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