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This paper presents a linearization approach for Sequential Power Amplifiers (SPAs) through pre-distortion. The signal characteristics and pre-distortion waveforms for the main and peaking amplifiers are derived mathematically. The pre-distortion approach is validated experimentally by measurement of the reconstructed signals. It is found that the signal characteristics results in an at least three...
This paper presents an analysis of a sequential power amplifier (SPA) in a transmitter with an FPGA-circuit at the input and a directional coupler at the output. The nonlinear combining characteristics of the output coupler are investigated. The coupling strength and the ratio of maximum power of peaking and main amplifier are discussed as design parameters. A switched coupler is examined as the combiner...
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