Haedong Jang, Richard Wilson, T. Canning, David Seebacher, C. Schuberth, B. Arigong
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Self-outphasing Chireix power amplifier using device input impedance variation
A new outphasing signal splitter for a radio frequency (RF) single input Chireix power amplifier without using digital signal processing is introduced. Input signal phase control versus power for outphasing operation is obtained by using only a linear circuit, exploiting the input impedance variation of non-ideal devices. A 52.6 dBm peak output power, 6 dB back-off Chireix power amplifier is built operating at 2.17 GHz. More than 50% drain efficiency is maintained over 5.7 dB output power back-off range.
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