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使用GaN HEMT功率器件,设计了一款多倍频程高效率功率放大器.利用负载牵引技术分析输入功率、偏置电压、工作频率对功率器件输出阻抗的影响,从而寻找出满足宽带性能的最优阻抗区域;输入、输出匹配网络采用了切比雪夫多节阻抗变换器的综合设计方法,很好地拓展了匹配网络的带宽性能,从而实现了0.8 ～4.0 GHz(相对带宽133％)多倍频程高效率功率放大器电路.连续波大信号测试结果表明:在0.8～4.0 GHz的频率范围内输出功率为39.5～42.9 dBm,漏极效率为54.20％～ 73.73％,增益为9.4～12.0 dB.在中心频率2.4 GHz未利用线性化技术的情况下使用5 MHz WCDMA调制信号测试得到邻近信道泄漏比(ACLR)为-27.2 dBc.设计的工作频率能够覆盖目前主要的无线通信系统GSM900M、WCDMA、DCS1800 LTE、PCS1900 LTE、3.5GHz WiMAX以及下一代移动通信系统(5G)等.“,”This paper presents a multi-octave broadband high-efficiency power amplifier using GaN HEMT device.The optimal impedance regions of the active device was found by loadpull simulation.The Chebyshev multi-section matching transformers are employed to design input and output matching networks with extended bandwidth,thus achieving multi-octave broadband high-efficiency power amplifier at the frequency band of 0.8 ～4.0 GHz (133％ fractional bandwidth).High-efficiency wideband power amplifier is designed and experimented,the measured results show a drain efficiency (DE) of 54.20％ ～ 73.73％ with an output power of 39.5 ～42.9 dBm and the gain of 9.4 ～ 12 dB.For a 5 MHz WCDMA signal,the adjacent channel leakage ratio of the power amplifier reaches-27.2 dBc without digital pre-distortion at center frequency 2.4 GHz.The frequency range of this paper covers modern wireless communication systems like GSM900M,WCDMA,DCS1800 LTE,PCS1900 LTE,3.5 GHz WiMAX and 5G etc.