一种简单实用的差频方法原理研究及应用  

Simple Method of Improving the Differential Frequency Using D Flip-Flop

作　　者：程坤[1] 黄庆安[1] 秦明[1] 茅盘松[1] 

机构地区：[1]东南大学MEMS教育部重点实验室,南京210096

出　　处：《电子器件》2006年第2期473-475,共3页Chinese Journal of Electron Devices

基　　金：国家自然科学基金资助项目(60476019);江苏省自然科学基金资助项目(BK2003052)

摘　　要：介绍了D触发器差频的方法和应用条件,用最基础的时序分析的方法,对D触发器差频做一个理论上的验证,定量给出应用条件,并分析了产生误差的原因和最大的误差范围。同时,对这一方法的应用范围进行了拓展,给出了输入方波不对称时,对占空比限制的关系式。我们用软件仿真和试验结果验证了结论,并介绍了我们如何将D触发器差频方法用在湿度传感器的频率检测上。A simple of improving the differential frequency by D flip-flop is introduced. The method is verified by timing analysis. Numberical application conditions are given out. The reason for the error production is analyzed and the maximum error range are calculated. At the same time, a relation to extend the application range is obitained and the method is made to be valid even if the input square wave is not symmetrical. Simulation results agree with the experiments. Finally, a frequency detection of a humidity sensor output with this D flip-flop differential frequency method is presented.

关 键 词：D触发器 频率检测 差频 

分 类 号：TN702[电子电信—电路与系统]