Abstract
ALTHOUGH there is a great deal of information concerning the noise produced by thermionic valves at radio frequencies, there do not appear to have been published data for the low-frequency noise intensity they produce under amplifying conditions. It has long been known that the noise intensity increases as the frequency to which the observational system is tuned is diminished, and a theory of the origin of this so-called ‘flicker' noise has been given by Schottky1 and modified by Macfarlane2. One of us (E. J. H.) has made measurements of valve noise and found that the intensity of the low-frequency noise varies approximately inversely as frequency in the range 10–1,000 c./s. At 1,000 c./s. it was not observable above the ‘shot' noise. If expressed as an equivalent fluctuation E.M.F. at the grid, the low-frequency noise was remarkably constant from valve to valve.
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References
Phys. Rev., 28, 74 (1926).
Proc. Phys. Soc., 59, 366 (1947).
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HARRIS, E., BISHOP, P. Low-Frequency Noise from Thermionic Valves Working under Amplifying Conditions. Nature 161, 971 (1948). https://doi.org/10.1038/161971a0
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DOI: https://doi.org/10.1038/161971a0
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