电磁干扰测试接收机-振荡器和检波

1、题目： 电磁干扰测试接收机-振荡器和检波 器的设计 电磁干扰接收机振荡器和检波器的设计摘要装装订线电磁干扰（或电磁干扰，也被称为射频干扰或射频干扰当在高频或射频干扰）是由于电磁感应或电磁射线影响电路的外部源。电磁干扰接收机（EMI）是用于测量电磁输入频率量的专门仪器。本课题是EMI接收机中的一个子课题。本文的课题即电磁干扰接收振荡器和检波器的设计是保证电磁干扰接收机准确稳定工作的重要保证，如果按照模电的知识来设计本课题将会十分的繁琐而且要计算很多参数，导致准确的不够高，所以对振荡器就使用芯片来实现，本文根据EMI接收机的整体设计要求采用AT89c51、AD7008相结合利用DDS（数字频率直接

2、合成）原理来实现电磁干扰接收机的一本振。二本振和三本振利用摩托罗拉公司的E1648等芯片来实现该系统中的振荡器电路原理图。检波电路环节要求实现均值检波峰值检波以及准峰值检波，所以在典型的原理图上将参数多次修改反复的在Multisim仿真软件上进行仿真，对比前后输入输出波形分析对参数进行优化选择，最终得到比较理想的元器件参数，其结果符合本课题的设计要求。关键词：电磁干扰；振荡器；检波器；仿真EMI RECEIVER- Design of oscillator and detection circuit ABSTRACTElectromagnetic interference (or electr

3、omagnetic interference, also called radio frequency interference and radio frequency interference when in the high frequency or radio frequency interference) is due to the electromagnetic induction and electromagnetic radiation affect the external source circuit. Electromagnetic interference (EMI) r

4、eceiver is used to measure electromagnetic frequency of input quantity of specialized instruments. This topic is a corpus of EMI receiver. This paper topic of electromagnetic interference and geophone receiving oscillator design is to guarantee the accuracy of the emi receiver the important assuranc

5、e of stable work, if the electricity knowledge to design this topic will be quite cumbersome and to calculate a lot of parameters, leading to a high accurate enough, so is used for oscillator chip to implement,in this paper, according to the requirements of the EMI receiver overall design combined w

6、ith AT89c51 and AD7008 use DDS (direct digital frequency synthesis) principle to realize the electromagnetic interference receiver a vibration. 2 and 3 of this vibration using MOTOROLA E1648 chips to implement the oscillator circuit principle diagram of the system. Detection circuit link for average

7、 detection peak detection and quasi-peak detector, so in a typical schematic diagram of the general parameter modify many times repeatedly in Multisim simulation software simulation, input and output waveform before and after the contrast analysis to optimize the parameters choice, finally got ideal

8、 components parameters, the results comply with the design requirements of this subject. Key words：EMI；oscillator；detector；simulation；目录TOC o 1-1 t 标题 2,1,标题 3,1 h u HYPERLINK l _Toc14885 1前言 通过访问相关的网站得到了所用芯片的技术参数以及典型的外围电路连接图，并对参数进行修改来满足本课题的设计要求。设计中采用AT89c51和AD7008、E1648芯片完成了电磁干扰接收机中振荡器和检波器的电路原理图，并用

9、Muitisim仿真软件上进行了仿真，通过对比输入输出波形的对比以及改进，其结果达到了预想的设计要求。 装装订线参考文献1胡宴如. 高频电子线路 M.北京：高等教育出版社，2009：173-1822彭沛夫. 微波技术与实验 M.北京：清华大学出版社，2007：285-2893黄智伟. 通信电子电路 M.北京：机械工业出版社，2007：274-2764李棠之. 通信电子电路 M.北京：电子工业出版社，2001：82-835华成英. 模拟电子技术基础 M.北京：高等教育出版社，2006：404-4056区健昌. 电子设备的电磁兼容性设计 M.北京: 电子工业出版社, 2003: 90-94 7白同云等.