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为了在功率回退时满足功率放大器对高效率的要求,提出了一种采用阻抗缓冲匹配技术的Doherty功率放大器。通过负载牵引仿真,得到功放管的最佳基波和谐波负载阻抗。在此基础上,采用一种谐波控制阻抗匹配网络设计方法来设计主/辅路放大器的输出匹配网络,实现了高回退效率。为了验证该方法的有效性,设计并实现了一个1.635GHz高效率Doherty功率放大器。测试结果表明,该放大器的饱和功率大于44dBm,峰值效率为75%,6dB功率回退时的效率为70%。该方法能有效提高Doherty功率放大器的回退效率。
In order to meet the high efficiency requirement of power amplifier during power back-off, a Doherty power amplifier with impedance-matched matching technique is proposed. Through the load traction simulation, get the best fundamental and harmonic load impedance of the power amplifier tube. On this basis, a harmonic control impedance matching network design method to design the output matching network of the main / auxiliary amplifier, to achieve a high backoff efficiency. To verify the effectiveness of this method, a 1.635GHz high efficiency Doherty power amplifier is designed and implemented. The test results show that the amplifier’s saturation power is greater than 44dBm, the peak efficiency of 75%, 6dB power back to the efficiency of 70%. This method can effectively improve the back-off efficiency of Doherty power amplifier.