一种非线性元件实现线性放大的改进技术与仿真

提出了一种改进的非线性元件实现线性放大（Linear Amplifier Using Nonlinear Components,LINC）理论，将幅度和相位均有变化的射频信号分离成包络信号和恒包络角调信号，将包络信号分两路反相调制到后者的相位中，对两路调制后的恒包络信号进行变频放大，通过减法电路得到放大后的上变频输入射频信号.因为恒幅信号可以在放大器的非线性区放大而不失真，提高了整体效率高.推导出其电压增益为KG/Em，并对不同频率和幅度进行了仿真，仿真结果表明实现了理论分析预期的放大效果.

An improvement and simulation of linear amplification with nonlinear components

An improved theory of linear amplification with nonlinear components(LINC) is proposed. Input RF signal is separated into envelope component and constant envelope anglemodulated component. Two branches of constant envelope anglemodulated component phase modulated by envelope component respectively and conversely are converted frequency and amplified. The amplified upconverted input signal is achieved through a subtracting circuit. Because the amplification of constant envelope signal can be carried on without distortion in nonlinear region, the whole work efficiency is high. Power gain of LINC amplifier is derived as KG/Em and simulation of the circuit is operated and analyzed. The prospect of theoretical amplification effect is realized and high power efficiency is obtained.