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This paper describes a new method for measuring AM-AM and AM-PM nonlinearities in microwave radio components. This new method is called the PM null technique. This method is accurate and easy to implement. Both the carrier and modulation frequencies can be changed easily. Results of AM-AM and AM-PM measurements performed on a 8-GHz amplifier are given. This new method was compared with Moffatt's parabolic phase method and found to be in good agreement.
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John Moss (1987) studied this question.
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