基于DDS的地震检波器测试仪信号源设计
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摘要
为了解决传统测试仪信号源产生的交流激励信号频率控制不便、输出离散点多时频率范围受限的问题,并实现检波器各项性能参数的检测,研制了新型的检波器测试仪信号源。通过对测试仪信号源进行具体的分析,给出了详细电路图。信号源是由MSP430单片机和直接频率合成器(DDS)芯片AD9833构成的,通过串行接口编程设定。与现有的测试仪信号源相比,该信号源转换时间快,频率稳定度良好;周期离散点多;每周期输出4 096个点时频率范围可达1~100 Hz以上;信号失真度可达到0.1%以下,能够满足检波器测试仪的激励信号要求。
To solve the problems of traditional tester signal source,e. g.,the frequency of the AC excitation signal is difficult to be controlled,and frequency range is limited for more output discrete points,and to implement detection of various performance parameters for geophone,the new type of geophone tester signal source is researched and developed. Through specific analysis of tester signal source,detail circuit diagram is given. The signal source is composed of MSP430 single chip machine and direct digital synthesizer( DDS) chip AD9833,and is programming setup through serial interface. Comparing with existing tester signal source,this signal source features fast conversion,stable frequency and more cycle discrete points,when 4 096 points output in one cycle,the frequency range is up to 1 ~ 100 Hz; the signal distortion is less than0. 1%; it can satisfy the requirement of excitation signal for geophone tester.
To solve the problems of traditional tester signal source,e. g.,the frequency of the AC excitation signal is difficult to be controlled,and frequency range is limited for more output discrete points,and to implement detection of various performance parameters for geophone,the new type of geophone tester signal source is researched and developed. Through specific analysis of tester signal source,detail circuit diagram is given. The signal source is composed of MSP430 single chip machine and direct digital synthesizer( DDS) chip AD9833,and is programming setup through serial interface. Comparing with existing tester signal source,this signal source features fast conversion,stable frequency and more cycle discrete points,when 4 096 points output in one cycle,the frequency range is up to 1 ~ 100 Hz; the signal distortion is less than0. 1%; it can satisfy the requirement of excitation signal for geophone tester.
引文
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[2]段疾病.基于串行通信的地震检波器综合测试系统的设计实现[D].青岛:中国海洋大学,2013.
[3]莫红枝,甘井中.基于DDS技术的信号源设计[J].电脑知识与应用,2014,10(5):1098-1099.
[4]韩彬,傅冰.基于Mega8单片机和AD9833的正弦波发生器[J].石油仪器,2007,21(6):70-72.
[5]赵明芳.基于AD9850的低频信号发生器设计[J].仪器仪表学报,2010,31(4):1-2.
[6]田茹,罗伟雄.基于DDS技术的短波信号源的研制[J].电子世界,2003(3):33-35.
[7]郗艳华.程控增益放大器的实现[J].信息技术,2009,4(9):4-26.
[8]牛燕炜.有源低通滤波器的设计与仿真分析[J].现代电子技术,2007,251(12):181-183.
[9]康华光.电子技术基础—模拟部分[M].5版.北京:高等教育出版社,2008:152-200.
[10]高松松,王颖,刘云涛,等.CMOS峰值检测电路[J].微电子学与计算机,2011,28(9):73-75.
[11]沈建华,杨艳琴,翟骁曙.MSP430系列16位超低功耗单片机原理与实践[M].北京:北京航空航天大学出版社,2008:200-230.
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