论文-简易频率特性测试仪.docVIP

. PAGE . 摘要 本设计的实现的简易频率测试仪中主要包括正交扫频信号源的设计、被测网络的设计、信号混合电路的设计、低通滤波器的设计以及模数转换和显示模块的设计。利用直接数字式频率合成器AD9854实现正交扫频信号源的设计，被测网络我们采用LRC谐振电路设计实现，利用AD835设计了乘法混合电路，自己利用滤波器设计软件设计了滤波器软件，利用C8051f020单片机最小系统控制高速AD7862完成模数的转换，最后在LCD屏上显示得到的相频曲线和幅频曲线。 本系统中设计中我们及设计完成了要求完成任务外，设计了友好人机交互接口，实现了频率可设置、在实现的过程中不仅能够改变频率，而且可以改变频率改变的分度值，最重要的是我们不论是改变频率还是频率改变的分度值我们都使用了同一个按键，设置了确认键让使用者有一个良好的体验。 关键词：简易频率测试仪，AD9854，正交扫频信号源，C8051f020单片机 . Abstract The design of a simple realization of the frequency measuring instrument mainly includes orthogonal frequency sweep signal source design, the tested network design, mixed signal circuit design, the design of low pass filter and analog to digital conversion and display module design. The design of direct digital frequency synthesizer AD9854 to achieve orthogonal frequency sweep signal source, the measured network we use LRC resonant circuit design, the multiplication of mixed circuit design using AD835, their use of filter design software to design filter software, using C8051f020 single chip minimize system control of high speed AD7862 analog-to-digital conversion, finally shows the phase frequency curve the amplitude frequency curve in the LCD screen. This system design in the US and completed the design requirements to complete the task, friendly man-machine interface design, the frequency can be set up, not only can change the frequency in the process of realization, indexing and can change the frequency change value, the most important is whether we are indexing change frequency or frequency change values we all use the same key, set the confirm button allows the user to have a good experience.This system design in the US and completed the design requirements to complete the task, friendly man-machine interface design, the frequency can be set up, not only can change the frequency in the process of realization, indexing and can change the frequency change value, the most important is whether we are indexing change frequency or frequency change values we