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提出了一种基于包络检测的射频功率放大器平均效率提高技术。该技术通过片上集成的包络检测器检测输入信号强度,通过动态配置功率放大管的尺寸,并调节输出阻抗匹配网络优化负载阻抗,提高功率放大器在低输出功率下的效率,达到提高功率放大器平均效率的目的。电路采用0.18μm CMOS工艺实现,后仿真结果表明,在高输出功率模式下,该射频功率放大器的输出1dB压缩点为18.05dBm,PAE为30.2%;在两档低输出功率模式下的输出1dB压缩点分别为14.9dBm和11dBm,PAE分别为24.11%和17.1%。
A new technique of improving the average efficiency of RF power amplifier based on envelope detection is proposed. The technology detects the input signal strength through an on-chip envelope detector. By dynamically configuring the size of the power amplifier tube and adjusting the output impedance matching network to optimize the load impedance, the efficiency of the power amplifier at low output power can be increased to improve the power amplifier average The purpose of efficiency. The circuit is implemented in a 0.18μm CMOS process. The simulation results show that the output power of the RF PA is 18.05dBm at the 1dB compression point and 30.2% at the PAE in the high output power mode. The output 1dB compression at 2-step low output power mode The points were 14.9 dBm and 11 dBm respectively, with PAEs of 24.11% and 17.1%, respectively.