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 adjustable 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 compensation 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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Key words:
- Schottky diode /
- series-parallel /
- pre-distortion /
- amplitude expansion /
- phase expansion
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图 1 串联式二极管式模拟预失真电路原理图
Figure 1. Schematic diagram of series diode analog pre-distortion circuit
图 3 串联式二极管模拟预失真电路仿真结果图
Figure 3. Simulation results of series diode simulation pre-distortion circuit
图 4 并联式二极管式模拟预失真电路原理图
Figure 4. Schematic diagram of parallel diode analog pre-distortion circuit
图 6 并联式二极管模拟预失真电路仿真结果图
Figure 6. Simulation results of parallel diode simulation pre-distortion circuit
图 8 起始端串联二极管时幅相曲线变化图
Figure 8. Amplitude and phase changes curve while connecting a series Schottky diode in the starting circuit (A in Fig. 7)
图 9 起始端并联二极管时幅相曲线变化图
Figure 9. Amplitude and phase changes curve while connecting a parallel Schottky diode to the starting circuit (A in Fig. 7)
图 10 中间电路串联二极管时幅相曲线变化图
Figure 10. Amplitude and phase changes curve while connecting a series diode in the intermediate circuit (B in Fig. 7)
图 11 中间电路并联二极管时幅相曲线变化图
Figure 11. Amplitude and phase changes curve while connection a parallel diode in the intermediate circuit (B in Fig. 7)
图 12 终端串联二极管时幅相曲线变化图
Figure 12. Amplitude and phase changes curve while connecting a series diode in the terminal circuit (C in Fig. 7)
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