一种简易数字移相器的设计  被引量:2

Design of a simple digital phase shifter

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作  者:黄子君 王文虎[1] 彭琛[1] 聂超凡 Huang Zijun;Wang Wenhu;Peng Chen;Nie Chaofan(College of Computer and Electrical Engineering,Hunan University Arts&Science,Changde 415000,China)

机构地区:[1]湖南文理学院计算机与电气工程学院,湖南常德415000

出  处:《湖南文理学院学报(自然科学版)》2021年第2期63-67,共5页Journal of Hunan University of Arts and Science(Science and Technology)

基  金:湖南省大学生创新创业训练计划项目(湘教通〔2019〕219号)。

摘  要:基于微处理器STM32F407的数字移相器,提出了一种数字可调的双路移相器。移相器由微处理器片内ADC采集输入信号,借助FFT算法,分辨输入信号的频率,为精确取出一周期输入信号的N点序列,调节ADC的采样频率刚好为输入信号的N倍,取出N点数据序列,运用片内定时器精确控制DAC输出的延时,从而控制移相度数,DAC循环输出N点信号序列,并经过低通滤波器,得到移相信号。为保证移相信号幅频无失真,引入反馈验证,采集输出的移相信号与输入信号进行频谱比对,若不一致,则重新移相,直至幅频一致。设计实现了输入信号0°~360°任意度数的移相,移相效果良好。Based on the digital phase shifter of microprocessor STM32F407,a digital adjustable dual-channel phase shifter is proposed.The phase shifter collects the input signal by the on-chip ADC of the microprocessor,and uses the FFT algorithm to distinguish the frequency of the input signal.In order to accurately extract the N-point sequence of the input signal in a period,adjust the sampling frequency of the ADC to be exactly N times the input signal.The N-point data sequence uses the on-chip timer to precisely control the delay of the DAC output,thereby controlling the degree of phase shift.The DAC cyclically outputs the N-point signal sequence and passes through a low-pass filter to obtain the phase-shifted signal.In order to ensure that the amplitude and frequency of the phase-shifted signal is not distorted,feedback verification is introduced,and the collected and output phase-shifted signal is compared with the input signal.The design realizes the phase shift of the input signal by any degree from 0° to 360°,and the phase shift effect is good.

关 键 词:数字移相 FFT 微处理器 两路移相 

分 类 号:TN623[电子电信—电路与系统]

 

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