频谱分析仪在高频电子线路实验中的应用  

Application of spectrum analyzer in high frequency electronic circuit experiments

作　　者：罗会容 LUO Huirong(School of Physics and Information Engineering,Jianghan University,Wuhan 430056,China)

机构地区：[1]江汉大学物理与信息工程学院,湖北武汉430056

出　　处：《实验室科学》2020年第3期192-195,共4页Laboratory Science

摘　　要：高频电子线路课程中,需要分析信号的频谱特性、幅频特性和相频特性,以及非线性器件对信号失真的影响等,传统实验室中的示波器已不能满足需要,引入频谱仪非常有必要。以测量小信号放大电路性能为例,介绍了用带扫频的频谱仪测量放大电路的幅频特性的方法,并测量了小信号放大电路的放大倍数、通频带和矩形系数,绘制出了幅频特性曲线图,并与传统的点频法做了比较。结果表明,用频谱分析仪测量幅频特性实验过程简单,结果直观准确,便于对放大电路性能好坏进行理论分析和高频实验教学。In the course of high-frequency electronic circuit,it is necessary to analyze the spectral characteristic,amplitude-frequency characteristic and phase-frequency characteristic of the signal,and the influence of non-linear devices on the signal distortion.The traditional oscilloscope in the laboratory cann t meet the need.It is very necessary to introduce the spectrum analyzer.Taking the measurement of the performance of the small signal amplifier as an example,the method of measuring the amplitude-frequency characteristic of the amplifying circuit with the frequency spectrum analyzer with swept frequency is introduced.The magnification,passband and rectangular coefficient of the small signal amplifying circuit are measured,and the amplitude frequency characteristic curve is plotted,and compared with the traditional point-frequency method.The results show that the experimental process of measuring amplitude frequency characteristic with spectrum analyzer is simple,the results are intuitive and accurate,easy to conduct theoretical analysis of the amplifier circuit performance and high frequency experimental teaching.

关 键 词：频谱分析仪 幅频特性 小信号放大 点频法 

分 类 号：TN98[电子电信—信息与通信工程]