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Adjusting the biasing- and loading conditions in a power amplifier affects the linearity and efficiency of the PA. If an accurate nonlinear model for the transistor does not exist, load-pull measurements are necessary for a high-performance PA design. In this work load-pull measurements are performed under different biasing conditions in order to utilize the fully potential of the transistor in the...
Recently, due to the development of high efficiency supply modulators, the envelope tracking (ET) technique has grown in interest. ET PAs show a promising potential when it comes to improve efficiency when amplifying signal with peak-to-average ratio of several dBs. In this work several practical experiments are performed to find the potential of a test PA when envelope tracking is implemented. A...
Changing the class of operation in a power amplifier (PA) affects the linearity and the efficiency of the PA. In this paper, the linearization performance and the efficiency enhancement of a Digital Predistorter (DPD) in a transmitter is evaluated with different PA classes. The digital predistorter is implemented in real-time on a Digital Signal Processor (DSP). The PA under test is a 2-stage 2-watt...
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