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Published on: January 28, 2019
A simple and reliable technique to characterize amplitude to phase modulation distortion for high-frequency
Rigoberto Jauregui1, Joaquin Portilla, J A Reynoso-Hernández
1Department of Electricity and Electronics, University of the Basque Country, Leioa 48040, Spain.
Abstract:
This paper presents a simple and reliable measurement system for characterizing the amplitude to phase modulation (AM-PM) characteristics of high frequency amplifiers and nonlinear devices. The AM-PM measurement system is based on a null detector implemented with a double balanced mixer, and requires a voltmeter and a calibrated phase shifter. A 12 W class A radio frequency power amplifier has been designed using a GaN transistor, and the AM-PM has been measured using both the method proposed in this work and the classical method with a calibrated vector network analyzer. A good correlation between both methods is observed, which validates the proposed method.
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