基于特定相移匹配的连续类双频Doherty放大器

为了实现Doherty功率放大器在双频模式下的宽带高效工作,设计了一种基于特定相移匹配的连续类双频Doherty放大器。利用相移周期重复性原理,通过确定两个目标频段上所需要的特定相移,结合连续类放大器技术,对匹配网络进行设计,解决了传统双频Doherty放大器带宽受限的问题。设计和实现了一个2.2~2.7 GHz和3.1~3.4 GHz的双频Doherty放大器。测试结果表明,该功率放大器两个频段的饱和效率分别为64.1%~68%和60.1%~66.3%,6 dB回退效率分别达到了45.2%~52.1%和44.1%~48.5%,能满足未来移动通信系统多频段同时工作的需求。

A Continuous Class Dual-Band Doherty Amplifier Based on Specific Phase Delay Matching Network

In order to achieve broadband efficient operation of Doherty power amplifier (DPA) in dual-band mode, a continuous class dual-band DPA based on specific phase delay matching was designed. By using the phase delay period repeatability principle, the specific phase delay required on the two target frequency bands was determined. Combined with the continuous class amplifier technology, the matching network was designed to solve the bandwidth limitation problem of the traditional dual-band DPA. A 2.2~2.7 GHz and 3.1~3.4 GHz dual-band DPA was designed and fabricated. The measurement results showed that the efficiency at saturation at the two frequency bands was 64.1%-68% and 60.1%-66.3%, and the 6 dB back off efficiency was 45.2%~52.1% and 44.1%~48.5%, respectively, which could meet the demand of multi-frequency band applications in future mobile communication systems.