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1、摘要在电子技术中,频率是最基本的参数之一,并且与许多电参量的测量方案、测量结果都有十分密切的关系,因此频率的测量就显得更为重要。测量频率的方法有多种,其中电子计数器测量频率具有精度高、使用方便、测量迅速,以及便于实现测量过程自动化等优点,是频率测量的重要手段之一。电子计数器测频有两种方式:一是直接测频法,即在一定闸门时间内测量被测信号的脉冲个数;二是间接测频法,如周期测频法。直接测频法适用于高频信号的频率测量,间接测频法适用于低频信号的频率测量。本文阐述了基于通用集成电路设计了一个简单的数字频率计的过程。关键词:频率,信号,周期Abstra
2、ctInelectronictechnology,thefrequencyisthemostbasiconeoftheparameters,andwithanumberofelectricalparametersofthemeasurementprogram,measurementmoreimportant,Thereareseveralwaysofmesuringfrequency,inwhichelectroniccounterthefrequencywithhighprecision,easytouse,quickmeasuremen
3、ts,andiseasytorealizetheadvatagesofautomaionofmeasurementprocessisanimportantmeansoffrequencymeasurement.ElectronicCounterFrequencyMeasurementTherearetwoways:First,thedirectfrequencymeasurementmethod,thatis,thegateinacertainperiodoftimemeasuredthenumberofmeasuredsignalpuls
4、e;2isindirectfrequencymeasurementmethod,suchascyclefrequencymeasurementmethod.Directfrequencymeasurementmethodforhigh-frequencysignalsoffrequencymeasurement,indirectfrequencymeasurementmethodforlow-frequencysignaldoffrequencymeasurement.Inthispaper,basedonacommomintegrated
5、circuitdesignofasimpledigitalfrequencymeterprocess.Keywords:frequency,signal,periodI目录摘要.................................................................................................................Ⅰ一、引言(一)数字频率计概述.........................................................
6、............................1(二)问题提出.................................................................................................1(三)设计思想.................................................................................................1二、方案论证与比较(一)方案选择..................
7、...............................................................................21、总体方案比较...............................................................................................22、测频方案比较.................................................................................
8、..............2(二)测频原理...................................................................