
Accession Number : AD0861076
Title : Nonlinear MultiSignal 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 multisignal nonlinearities can be predicted from the singlesignal nonlinearities. These have been theoretically calculated in an earlier paper. Fifth order power series expansions of the singlesignal 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 'selfdistortion', i.e. the compression and the AMtoPM conversion of one of the signals, is strongly influenced by the total power carried by the other signals. The crossdistortion quantities are generally about twice as large as the selfdistortion 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