Abstract
A 2.14 GHz gallium nitride class-F power amplifier (PA) achieving both high efficiency and phase linearity over a wide frequency range is presented. The broadband PA is designed as one channel of outphasing architecture in cellular base-stations and analyzed in amplitude and phase domains. In amplitude domain, the PA exhibits measured maximum power added efficiency (PAE) of 80.1% with an output power of 40.7 dBm at 2 GHz. The PA achieves PAE higher than 55% over 500 MHz frequency range. The optimum second-harmonic load impedance enables the broadband operation. In phase domain, phase linearity of the PA is characterized by using phase modulation signals derived from single-carrier 10 MHz, two-carrier 40 MHz, and two-carrier 60 MHz long term evolution signals with 6.5 dB peak-to-average power ratio.
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