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Simultaneous AM-AM/AM-PM distortion measurements of microwave transistors using active load-pull and six-port techniques

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3 Author(s)
Ghannouchi, F.M. ; Dept. of Electr. & Comput. Eng., Ecole Polytech. de Montreal, Que., Canada ; Guoxiang Zhao ; Beauregard, F.

A programmable active load-pull measurement system using two six-port reflectometers and three passive two-port standards has been developed to obtain load-pull contours of the transistor's input-output phase shift variations over a wide dynamic range of the input power. The output power, gain, power-added efficiency, and phase shift are measured simultaneously at the transistor's input and output reference planes. The phase distortion versus input power, φ~Pin, and the AM-PM conversion coefficient at various power levels, k~Pin, are obtained for different load impedances by post-measurement calculations. A NE8001 MESFET is tested at f=1.7 GHz for the class A operation. The experimental results are also given

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Microwave Theory and Techniques, IEEE Transactions on  (Volume:43 ,  Issue: 7 )