【摘要】 文中采用数字系统与传统模拟超外差结合的方法设计频谱分析仪。该系统使用MSP430单片机控制本振源PLL的输出,实现自动连续扫频等功能,并将检波信号采集和处理,得到信号的频谱、振幅最大的频点和杂散数量,最后通过TFT-LCD将测量结果显示。其中,检波器采用乘法器和低通滤波器的组合,使得检波器的处理速度加快。整个系统采用超外差频技术,使整体成本降低。调试结果表明:该系统满足设计指标要求。更多还原

【Abstract】 The spectrum analyzer was designed by combining the digital system with the traditional analog superheterodyne method.MSP430 SCM controlled the output of the local oscillator PLL to achieve automatic,continuous,sweeping and other functions in the system.It can detect and process the detection signal and get the spectrum result,the frequency spectrum and the maximum number of spurs.Finally,the results were displayed via TFT-LCD. Among them,the geophone adopted the combination of multiplier and low-pass filter,so that the processing speed of the geophone is accelerated.The whole system adopts the superheterodyne frequency technology,the cost is reduced.The results of the commissioning show that the system meets all design specifications.更多还原