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A traveling-wave tube amplifier such as those employed in frequency-division multiplexed multiple-access communication-satellite repeaters is considered. The amplifier nonlinearity is assumed to follow an error-function characteristic, and the AM-PM conversion is taken to be a quadratic function of the envelope of the input signal. An exact expression allowing for both arbitrary amounts of amplifier saturation and AM-PM conversion is derived for the autocorrelation function of the amplifier output when the input is a Gaussian bandpass process. Distortion spectra are calculated for the parameters of a typical travelingwave tube transmitter.
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R. Pawula (1971) studied this question.
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