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基于自主研发的RF LDMOS功率晶体管以及散热法兰,设计了一款用于无线通讯以及L波段和S波段雷达系统的大功率高效率的功率放大器。在保证了器件的射频接地以及散热的前提下,在封装内部设计了输入内匹配和输出内匹配电路,提高了管芯的阻抗点以便于电路板匹配。利用Doherty功率放大器结构可以提高功率回退处效率的特点,结合输出内匹配对负载阻抗点的翻转作用,得到了一种结构优化的Doherty实现方案,在峰值功率处达到398 W的输出功率,52%的漏极效率;以及功率8 d B回退的平均功率处126 W的输出功率,43%的漏极效率。这种改进技术进一步提高了功率回退处的效率,相对普通Doherty功率放大器结构,性能提升了16%,改善了无线通信系统的射频性能。
Based on an independently developed RF LDMOS power transistor and heatsink flange, a high-power, high-efficiency power amplifier for wireless communications and L-band and S-band radar systems is designed. On the premise of ensuring the RF grounding and heat dissipation of the device, the internal matching and output matching circuits in the package are designed and the impedance points of the die are increased to facilitate the circuit board matching. By using Doherty power amplifier structure to improve the efficiency of power back-off, a structurally optimized Doherty implementation is achieved with the matching of output matching to the load impedance point. The output power reaches 398 W at peak power. % Drain efficiency; and an output power of 126 W at an average power of 8 d B backoff, 43% drain efficiency. This improved technology further improves the efficiency of the power back-off, improving the performance of wireless communication system RF performance by 16% compared with ordinary Doherty power amplifier structure.