It appears not to have been widely recognized that intermodulation distortion of a SSB-AM signal will be generated by AM-PM conversion effects present in amplifiers (such as traveling wave tubes), as well as by output-input nonlinearity. When the SSB-AM signal is carrying multichannel telephony this can be an important source of distortion. In the present paper, a formula is developed relating intermodulation distortion to AM-PM conversion level. The theory is also applied to two-tone testing, in order to allow comparison with experiment. The experimental results are found to be in satisfactory agreement with theoretical predictions.
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Medhurst et al. (1964) studied this question.
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