赵宇轩,李子恒,高彦昌,等. 基于差分控制方法的高精度时间调制模块[J]. 电波科学学报,2024,39(2):1-9. DOI: 10.12265/j.cjors.2023093
      引用本文: 赵宇轩,李子恒,高彦昌,等. 基于差分控制方法的高精度时间调制模块[J]. 电波科学学报,2024,39(2):1-9. DOI: 10.12265/j.cjors.2023093
      ZHAO Y X, LI Z H, GAO Y C, et al. The high precision time-modulated module based on differential control method[J]. Chinese journal of radio science,2024,39(2):1-9. (in Chinese). DOI: 10.12265/j.cjors.2023093
      Citation: ZHAO Y X, LI Z H, GAO Y C, et al. The high precision time-modulated module based on differential control method[J]. Chinese journal of radio science,2024,39(2):1-9. (in Chinese). DOI: 10.12265/j.cjors.2023093

      基于差分控制方法的高精度时间调制模块

      The high precision time-modulated module based on differential control method

      • 摘要: 为了满足时间调制模块的高精度幅度调控需求,本文提出差分控制方法来改进模块调制时序的产生方式。差分控制方法利用FPGA对输出方波信号的时延调节精度较高的特点,在保持方波占空比不变的情况下,通过改变两路方波控制信号的相位差,分别作用于串联关系的射频开关,从射频电路的角度使两开关导通时间相与,实现对模块导通时间的精准控制,从而对模块输出信号进行高精度幅度控制。基于该差分控制方法设计了验证模块,并进行了实物加工与测试,由于在模块设计中充分利用了不同射频开关在差分控制中的逻辑关系,因而在提高幅度调控精度的同时保持控制线数不变。实测结果表明,验证模块在工作频带内有着良好的各项性能。通过差分控制方法,在10 MHz调制频率下,模块能够实现步进0.25 dB、动态范围0~28.5 dB的幅度衰减控制,误差在±(0.1 dB+1%AS)以内。

         

        Abstract: In order to meet the high-precision amplitude control requirements of the time-modulated module, a differential control method is proposed in this paper to change the generation of modulation sequence. By utilizing the characteristic of high precision time delay control of square wave signals output by FPGA, the phase difference between two square wave signals is used as the control signal, while the duty cycle of the square wave signals is kept unchanged. The two square wave signals are connected to the RF switches in series and logically run as “AND gate”. The amplitude of the module output signal can be controlled in high precise due to the turn-on time of the module has been improved to a high precise. A verification module for the proposed method is designed, manufactured and tested. By fully utilizing the logical relationship of different RF switches in differential control, the amplitude control precision is improved while the control line number is kept unchanged. The experimental results demonstrate that the verification module has excellent performance in the operating frequency band. With the differential control method, the module can achieve amplitude attenuation control with a step size of 0.25 dB and a dynamic range of 0–28.5 dB at 10 MHz modulation frequency, with an error range within ±(0.1 dB+1%AS).

         

      /

      返回文章
      返回