Signal amplification in an Otype TWT with noise in the electron beam
Abstract
Approximate nonlinear theory is used to analyze the amplification of signals and narrowband microwave noise due to stochastic modulation of electron velocity and current at the input of an Otype traveling wave tube. Formulas are derived for calculating the noise coefficients of the tube as a function of dimensionless parameters and degree of nonlinearity. It is shown that in the nonlinear regime the coefficient of amplitude noise is smaller than in the linear regime, while the coefficient of phase noise is larger than in the linear regime. Both in the linear and nonlinear regimes the maximum relative contribution to the noise coefficient is made by antenna noise as well as noise due to velocity fluctuations; the smallest contribution is made by current fluctuations of the electron beam.
 Publication:

Radiotekhnika i Elektronika
 Pub Date:
 June 1983
 Bibcode:
 1983RaEl...28.1133K
 Keywords:

 Electron Beams;
 Microwave Amplifiers;
 Shot Noise;
 Signal Distortion;
 Signal To Noise Ratios;
 Traveling Wave Amplifiers;
 Amplitude Modulation;
 Beam Currents;
 Electron Trajectories;
 Fluctuation Theory;
 Noise Intensity;
 Nonlinear Systems;
 Phase Modulation;
 Stochastic Processes;
 Thermal Noise;
 Electronics and Electrical Engineering