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《Journal of Data Acquisition and Processing》 2011-01
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Choosing Suitable Logic Gate Mixer for Measuring Frequency Difference

Zhang Weiyu1,2,Dong Jinfeng2,Zhang Guoxiong1,Shan Huiyong2(1.State Key Laboratory of Precision Measuring Technology and Instruments,Tianjin University,Tianjin,300072,China;2.Department of Electromechanical Engineering,Tianjin Agriculture University,Tianjin,300384,China)  
In the design of measuring circuits based on frequency transducers,it is necessary to measure small frequency increments caused by the change of the measured parameter.The mixer receives inputs from the reference oscillator and the monitor oscillator,and a low pass filter produces an output with the difference of the two input frequencies.Two quasi-digital signals are connected to the inputs of the logic gate mixers and the output characteristics of the mixers are studied in theories and experiments.Results show that XOR and XNOR logic gate mixers have better performances for measuring difference frequency than other logic gate mixers.The duty cycle of input signals has an influence on the output performance of mixers and there is a simple low-pass filter circuit at 50% duty cycle.
【Fund】: 天津市高等学校科技发展计划基金(20070913)资助项目
【CateGory Index】: TN773
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