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):

Report Date:

1969-04-01

Pagination or Media Count:

36.0

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

Subject Categories:

  • Electrical and Electronic Equipment

Distribution Statement:

APPROVED FOR PUBLIC RELEASE