科研之友
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摘要
A symmetric Doherty power amplifier (DPA) based on integrated enhancing reactance (IER) was proposed for large back-off applications. The IER was generated using the peaking amplifier with the help of a desired impedance transformation in the lowpower region to enhance the back-off efficiency of the carrier amplifier. To convert the impedances properly, both in the lowpower region and at saturation, a two-impedance matching method was employed to design the output matching networks. For verification, a symmetric DPA with large back-off power range over 2.2-2.5GHz was designed and fabricated. Measurement results show that the designed DPA has the 9 dB back-off efficiency of higher than 45%, while the saturated output power is higher than 44 dBm over the whole operation bandwidth. When driven by a 20MHz LTE signal, the DPA can achieve good average efficiency of around 50% with adjacent channel leakage ratio of about -50 dBc after linearization over the frequency band of interest. The linearity improvement of the DPA for multi standard wireless communication system was also verified with a dual-band modulated signal.
