一款应用于Wi-Fi 6的宽带、高功率数字Doherty功率放大器OA

In this study,we propose a class-G high-power broadband digital Doherty power amplifier(DPA)for Wi-Fi 6 applications,operating from 5.125 to 7.125 GHz.The proposed DPA is based on a polar architecture that combines Doherty load modulation with class-G amplification to achieve optimal efficiency,and it is fabricated using a 22-nm complementary metal-oxide-semiconductor(CMOS)process.At the output,a λ/4 transmission line-integrated transformer-based combining network minimizes insertion loss and enables watt-level output with an 8-bit amplitude modulation module.The results of post-layout simulations showed a saturated output power of 29 dBm,a peak power-added efficiency(PAE)of 23%,and 6-and 12-dB back-off PAEs of 22%and 13%,respectively.For an 80-MHz 256-quadrature amplitude modulation(256-QAM)signal,the DPA delivers an average output power of 21 dBm with an error vector magnitude(EVM)of-30 dB.It also achieves a phase error of less than 6° across a 2-GHz bandwidth via a compact fully differential broadband quadrature input network with an 8-bit phase modulation module.Thus,the proposed DPA meets the wideband,high-efficiency and high-linearity requirements of Wi-Fi 6 systems.