Accession Number : AD0684733

Title :   SPECTRAL DISTORTION OF NOTCH FILTERED FM SIGNALS IN SATURATED AMPLIFIERS.

Descriptive Note : Technical rept.,

Corporate Author : STANFORD UNIV CALIF STANFORD ELECTRONICS LABS

Personal Author(s) : Cumming,R. C. ; Oppoboni,E. G.

Report Date : JAN 1969

Pagination or Media Count : 40

Abstract : In certain applications, a narrowband spectral notch may be desired in the output spectrum produced by a wide band interference system. Unfortunately, nonlinear effects in saturating power amplifiers can severely degrade a spectral notch applied at the amplifier input. Theoretical and experimental studies of this phenomenon are presented for notch filtered FM signals. The experiments used a TWT amplifier, and the measured results are presented graphically. The TWT input was an FM signal followed by a notch filter. In specific situations of interest, a perfect notch at the TWT input degrades to a 6-dB notch at the output. This and other results are presented and shown to agree well with theoretical predictions. (Author)

Descriptors :   (*POWER AMPLIFIERS, DISTORTION), ELECTRONIC COUNTERMEASURES, RADIOFREQUENCY FILTERS, SIGNALS, TRAVELING WAVE TUBES, FREQUENCY MODULATION

Subject Categories : Electrical and Electronic Equipment
      Countermeasures

Distribution Statement : APPROVED FOR PUBLIC RELEASE