输入谐波相位控制的宽带高效率连续逆F类功率放大器

Broadband High-Efficiency Continuous Inverse Class-F Power Amplifier Based on Input Harmonic Phase Control

卫星通信与地面移动通信的互补融合已成为趋势,这意味着以功率放大器(功放)为核心的无线射频前端需要应对大带宽和高效率的双重挑战。该文提出的输入谐波相位控制方法可以有效突破功放带宽和效率相互制约的瓶颈,并以连续逆F类工作模式为基础,通过控制输入端二次谐波相位来重构晶体管漏极时域波形,在保证高效率的同时获得阻抗设计空间的大幅提升。利用这一拓展的阻抗设计空间,研制了一款1.7~3.0 GHz的连续逆F类功放,实测结果表明在该工作频段内可以实现40.62~42.78 dBm的输出功率和72.2%~78.6%的漏极效率,同时增益可达10.6~14.8 dB。

The integration of satellite communication and ground mobile communication in a complementary manner has emerged as a prevailing trend,which means the wireless radio frequency front-end with Power Amplifier(PA)as the core need to tackle the dual challenges of high efficiency and large bandwidth.In this paper,the proposed input harmonic phase control method effectively overcomes the bottleneck of mutual restriction between bandwidth and efficiency.By employing a continuous inverse Class-F operating mode,it enables the reconstruction of transistor drain waveform through precise control of the input second harmonic phase.This approach ensures high efficiency,while significantly enhancing the impedance design space.Based on the expanded design space,a continuous inverse Class-F PA is designed and fabricated over the frequency band of 1.7~3.0 GHz.Experimental results demonstrate an output power of 40.62~42.78 dBm,accompanied by a drain efficiency ranging from 72.2% to 78.6%.Additionally,the gain of the designed PA ranges from 10.6 dB to 14.8 dB.