双路相位差可调信号发生器的设计

Design of dual tunable phase difference signal generator

为了进行双路信号相位的研究,提出基于DDFS的双路相位差可调信号发生器的系统设计。系统利用单片机和FPGA实现了双路正弦信号输出,输出频率范围为0.003Hz^750kHz,分辨率为0.003Hz,相位差调节范围为0°~359°,分辨率为0.01°,幅度范围为-5^+5V,分辨率为0.005V。它不仅可输出2路相同频率、相位差可调的正弦信号,而且可分别作为2路独立的可调频、调幅、调相的信号发生器使用。经测试验证,系统运行稳定、操作方便。

For the research of dual path signal phase, the dual tunable phase difference signal generator based on direct digital frequency synthesize （DDFS） is designed. This system realizes dual sine wave signal output from 0.003 Hz to 750kHz based on micro-controller （MCU） and FPGA. It also can provide frequency step by 0.003 Hz, phase shifting from 0° to 359° and adjustable amplitude from -5 V to 5 V,and amplitude step by 0.005 V. It can output not only two sine wave signals with same frequency and tunable phase difference but also two independent signals which frequency, amplitude and phase can be adjustable. By testing the performance of system is stable and the operation is convenient.