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不同位置二极管串并联方式对射频电路的影响
Influence of series and parallel diodes in different positions on RF circuit
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摘要: 分析了单支肖特基二极管以及串并联模拟预失真电路的幅度和相位的非线性特性,仿真结果表明可以将二极管作为模拟预失真电路可调节的核心器件.利用传输矩阵分析得出改变肖特基二极管在预失真电路的不同位置,及不同的串并联连接方式,可以使幅度相位补偿曲线得到改善.由仿真结果可以看出,在不同位置以串联或并联的形式在电路中连接二极管,可有效改变曲线的位置和斜率,从而得到理想的目标曲线形状.Abstract: In this paper,the nonlinear characteristics of the amplitude and phase of a single Schottky diode and series and parallel analog pre-distortion circuit are analyzed.The simulation results show that the diode can be used as an adj ustable core component of an analog pre-distortion circuit.By using the transmission matrix,it is found that connecting the Schottky diodes in different positions of the predistortion circuit and selecting serial or parallel modes can improve the amplitude and phase compensa-tion curves.The simulation results show that connecting a Schottky diode in series or in parallel at different positions of the circuit can effectively change the position and slope of the curve,so as to obtain an ideal target curve shape.
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