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This paper presents, for the first time, a multi-harmonic active envelope load-pull system allowing for the robust, high-speed characterization of devices used in modern microwave power amplifiers. Measurements of a commercially available 1W GaAs FET device demonstrate at least an eight-fold improvement in the measurement speed when compared to existing open-loop solutions. The developed active load-pull...
Power amplifiers used in modern wireless systems need to efficiently transmit signals, without distortion, that have complex envelopes with variable phase and amplitude. The design of these power amplifiers require that transistors are characterized under complex excitations into variable load impedances, so that determination of perfect matching conditions for optimum performance is achieved. This...
This paper presents broadband control electronics for active closed-loop envelope load pull system. This control electronics when integrated in the existing envelope load pull system provides a constant load with varying input power over large bandwidth. These two characteristics of the broadband control module make it a potential candidate for a novel tool in the power amplifier characterization...
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