一种用单片机产生准确频率正弦波的新方法  

New MCU-based Method of Generating Sine Wave with Precise Frequency

作　　者：刘根据[1] 杨延宁[1,2] 张艳阳[2] 侯勤宏 

机构地区：[1]延安大学西安创新学院,陕西西安710100 [2]西北大学光子学与光子技术研究所,陕西西安710069 [3]铁道部产品质量监督检验中心信号产品检验站,陕西西安710048

出　　处：《自动化仪表》2009年第2期63-64,共2页Process Automation Instrumentation

基　　金：西安市创新基金资助项目(编号:XA-AM-200712)

摘　　要：介绍了单片机产生正弦波的原理,误差分析表明低速单片机产生正弦波时频率会产生比较大的累积误差。提出了一种利用低速单片机产生准确频率正弦波的方法,并与传统方法产生的误差做了比较,结果表明这种方法大大提高了正弦波频率的准确度,最后给出了软件流程图。该方法在铁路轨道电路测试系统的应用中取得了很好的效果。The principle of generating sine wave by using single chip computer is introduced. From error analysis, it is indicated that accumulated error of the frequency of sine wave generated by low speed single chip computer is bigger,thus the method of generating sine wave with accurate frequency is proposed with still using low speed single chip computer. Comparing with the traditional method, the accuracy of frequency of sine wave is greatly enhanced. The flowchart of software is given finally. The proposed method has been used in circuit test system for railway tracks.

关 键 词：单片机 正弦波 准确度 稳定度 失真度 

分 类 号：TP311[自动化与计算机技术—计算机软件与理论]