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《Chinese Journal of Electron Devices》 2006-02
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Simple Method of Improving the Differential Frequency Using D Flip-Flop

CHENG Kun, HUANG Qing-An, QIN Ming, MAO Pan-Song(Key Laboratory of MEMS of Ministry of Education, Nanjing 210096,China)  
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.
【Fund】: 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)
【CateGory Index】: TN783
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