【摘要】 为了直观地了解电路的频率特性,研制了数字式电路系统频率特性分析仪。该系统应用稳态响应法测量电路的频率特性。使用DSP作为主控制芯片,完成系统的总体控制及数字信号处理;使用FPGA完成逻辑控制功能;使用集成的直接数字频率合成芯片输出全频率范围内的正弦波。系统对待测电路的输入信号及其输出响应采样,经数字信号处理后,获得电路的幅频特性和相频特性。实验验证表明,该仪器人机界面友好,测量速度快,测试波形与理论计算波形能较好吻合。更多还原

【Abstract】 To learn circuit system’s frequency characteristic Intuitively,Steady-state response measurements method is used to develop a kind of digital circuit system frequency characteristics analyzer.DSP is used as main controller to run the main program and do digital signal processing,FPGA is used to apply logic control function and integrated digital direct frequency synthesis chips is used to generate sine wave.The input signal and response of circuit under test is sampled by ADC module.The analyzer obtains the amplitude-frequency characteristics and phase-frequency characteristics after appropriate computing.Experiment show that this analyzer has friendly man-machine interface,measurement speed and the testing wave is consistent with the theoretical results.更多还原