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- W2037192438 abstract "A novel pre-distortion technique using two independently bias-controlled Schottky diodes is proposed to compensate the complicated nonlinear characteristics of the AlGaN/GaN HEMT microwave class-F amplifier, in which inferior intermodulation distortions are often observed for an output power range of large back-off. The newly developed technique has made it possible to achieve both high drain efficiency and low intermodulation distortion simultaneously. The developed linearizer was fabricated in MMIC form and applied to a one watt AlGaN/GaN HEMT class-F amplifier operating at 1.9 GHz, where harmonic frequencies up to the fifth higher order were controlled. With the diode predistortion linearizer, the third-order intermodulation distortion ratio (IMD3) of the 1.9-GHz class-F GaN HEMT power amplifier was improved over power output from 0 to 18 dBm. The IMD3 was under -40 dBc at output powers lower than 10 dBm. The amplifier had a maximum drain efficiency of 70.6 % at output power of 27 dBm." @default.
- W2037192438 created "2016-06-24" @default.
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- W2037192438 date "2009-12-01" @default.
- W2037192438 modified "2023-09-23" @default.
- W2037192438 title "A predistortion linearizer for a class-F GaN HEMT power amplifier using two independently controlled diodes" @default.
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- W2037192438 doi "https://doi.org/10.1109/apmc.2009.5385385" @default.
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