Design of Dual-band Large Rollback Doherty Power Amplifier Based on Asymmetric Architecture
The demand for multi-frequency power amplifier in RF system is increasing.Doherty power amplifier(DPA)based on active dynamic load modulation technology is a key component of RF front-end,and its efficiency and performance are the key to design,but the traditional single-band DPA with 6dB rollback can no longer meet the development needs.In this paper,a dual-band large rollback Doherty power amplifier operating at 2.6/3.5GHz is designed.Each module of Doherty is designed by the method of improved dual-band broadband matching network,and the high fallback range is realized by the asymmetric architecture.Through simulation verification,the saturation drain efficiency(DE)of the DPA in the two frequency bands exceeds 70%and 66.5%re-spectively,and the DE in the backtracking of 9 dB exceeds 52.5%and 47.3%respectively.The cor-responding saturation gain is greater than 7 dB,and the output power and efficiency near 3GHz are close to 0.The power amplifier achieves better isolation between bands.Meet the wireless communi-cation system multi-band large rollback requirements.
Dual frequency bandMajor regressionDPANew matching network
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