基于差动电路结构的多级串联式数控移相器实现研究

Research on Realization of Multistage Series Numerical Control Phase Shifter Based on Differential Circuit Structure

移相器是无线通信系统和相控阵雷达接收机中的关键组件,用来实现信号相位的改变与均衡。提出了一种基于差动电路结构和RC元件的数控移相单元,该移相单元通过扫描脉冲控制差分对管轮流导通获取输出信号的相位差,改变RC元件参数可以调整移相数值。利用提出的数控移相单元构建了八级串联模型,实现了一种360°串联式数控移相器。Multisim软件仿真验证了数控移相单元设计的有效性,硬件实现测试结果表明:设计的多级串联式数控移相器工作良好,移相精度高,可达1.4°,实现了全周期范围内的相移控制。该数控移相器的实现为适时、灵活校准接收系统相位误差提供了重要的技术支撑。

Phase shifter is a key component in wireless communication system and phased array radar receiver,which is used to regulate and equalize signal phase.In this paper,a numerical control phase shifting element based on differential circuit structure and RC element is proposed.The phase shifting element can gain the phase difference of output signal through a scanning pulse control of the differential tube in turn.The phase shifting value can be adjusted by changing the parameters of RC element.An eight-stage cascade model is constructed by using the proposed Numerical Control(NC)phase shifter element,and a 360°tandem NC phase shifter is realized.Simulation results obtained by Multisim software verify the effectiveness of the design of NC phase shifter,and the test results of hardware implementation show that the design of multistage tandem NC phase shifter works well with high precision of 1.4°,and realizes the phase shift control in the full cycle range.The realization of the NC phase shifter provides an important technical support for the timely and flexible calibration of the phase error of the receiving system.