Accession Number : AD0861076
Title : Nonlinear Multi-Signal Traveling Wave Tube Theory.
Descriptive Note : Technical note,
Corporate Author : CHALMERS UNIV OF TECHNOLOGY GOETEBORG (SWEDEN) RESEARCH LAB OF ELECTRONICS
Personal Author(s) : Wallander, Sven
Report Date : APR 1969
Pagination or Media Count : 36
Abstract : The report gives an analysis of the nonlinearities arising in a TWT with N input signals. The signal frequencies are assumed to be confined within a narrow frequency band. The sum of the input signals is then equivalent to a single signal with a slow modulation of the amplitude and the phase and the multi-signal nonlinearities can be predicted from the single-signal nonlinearities. These have been theoretically calculated in an earlier paper. Fifth order power series expansions of the single-signal nonlinearities are used. Minimum amplitude nonlinearities are obtained for a beam voltage higher than that giving maximum small signal gain and minimum phase shift nonlinearities are obtained for a beam voltage lower than that. The power of the third and fifth order modulation products is minimum for a beam voltage between that for maximum small signal gain and that for minimum amplitude nonlinearities. The 'self-distortion', i.e. the compression and the AM-to-PM conversion of one of the signals, is strongly influenced by the total power carried by the other signals. The cross-distortion quantities are generally about twice as large as the self-distortion quantities. (Author)
Descriptors : (*TRAVELING WAVE TUBES, THEORY), NONLINEAR SYSTEMS, MODULATION, SERIES(MATHEMATICS), DISTORTION, MICROWAVE AMPLIFIERS.
Subject Categories : Electrical and Electronic Equipment
Distribution Statement : APPROVED FOR PUBLIC RELEASE