可重构通道选择型功率放大器设计

Design of reconfigurable channel-selective power amplifier

为满足现代无线通信系统小型化、集成化、低成本和高性能的需求,提出了一种新型的可重构功率放大器结构。该结构设计的输入匹配网络,能够实现1~3 GHz频段内的良好匹配;输出匹配网络将可重构技术和滤波匹配技术相结合,通过分布式PIN开关连接不同的滤波匹配电路,实现信号在多通道内高效的放大特性和工作频带的高选择性输出。采用CGH40010F GaN晶体管设计并加工了一款工作在1.5、1.8、2.4、2.6 GHz的功率放大器,其带宽约为200 MHz,通带外信号衰减可达-30 dB。通过测试,该功率放大器的饱和输出功率为40 dBm,增益维持在10 dB左右,最大功率附加效率(power added efficiency, PAE)可达到63%,实测结果与仿真结果具有较好的一致性。本文结构降低了电路复杂度和设计难度,具有高效率、高选择性等优势,为设计宽频带多功能可重构功率放大器提供了一种可行的方案。

In order to meet the demand for miniaturization,integration,low cost,and high performance of modern wireless communication systems,a new reconfigurable power amplifier structure is proposed.The structure is designed with an input matching network,which can be well matched in the 1−3 GHz frequency band.The output matching network is designed by combining reconfigurable technology and filtering matching technology.Different filtering matching circuits are connected by distributed PIN switches to realize efficient amplification characteristics of signals in multi-channel and highly selective output of working frequency band.The power amplifier working at 1.5 GHz,1.8 GHz,2.4 GHz,and 2.6 GHz is designed and processed using CGH40010F GaN transistor.The bandwidth is about 200 MHz,and the signal attenuation outside the passband can reach−30 dB.Through the test,the saturation output power of the power amplifier is 40 dBm,the gain is maintained at about 10 dB,and the maximum power added efficiency(PAE)can reach 63%.The measured results are in good agreement with the simulation results.This structure reduces circuit complexity and design difficulty,has high efficiency and selectivity advantages,and provides a feasible scheme for designing a wide-band multifunctional reconfigurable power amplifier.