（毕业设计论文）《数字频率计数器的设计》.doc

PAGE 精品 eq \o\ad(河南师范大学本科生毕业论文,　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　) （设 计） 数字频率计数器的设计 摘 要 数字频率计数器是计算机、通讯设备、音频视频等科研生产领域不可缺少的测量仪器。它是一种用十进制数字显示被测信号频率的数字测量仪器。它的基本功能是测量正弦信号、方波信号、三角波信号以及其他各种单位时间内变化的物理量。它的基本测量原理是，首先让被测信号与标准信号一起通过一个闸门，然后用计数器计数信号脉冲的个数，把标准时间内的计数的结果，用锁存器锁存起来，最后用显示译码器，把锁存的结果用LED数码显示管显示出来。 本设计是由模块电路组成的，包括各种集成块、逻辑器件、简单的电子器件。以此为基础设计的简易数字频率计，实现了频率和周期的测量。同时，本设计还使用了扩展电路，扩大了测量范围。最后对本设计中所用的集成电路，以及简易数字频率计的调试作了简单说明。 关键词： 频率计数器；集成电路；分频；译码；触发器  The Design of Digital Frequency Meter Abstract The digital frequency meter is an indispensable instrument of computers, communications equipment, audio, video production and other research fields. It is measured the signaling frequency the numeral metering equipment. which is one kind with the decimal digit demonstrated Its basic function is surveys the sine signal, the square-wave signal, the triangle wave signal and all that each kind of unit time endomorphism physical quantity. The basic measurement principle is, let the measured signal with the standard signal along through a gate. Then Counting the number of pulse signal, the standard time of the count results, the latches latch, Finally, show decoder, and the results latch LED digital display of show. This design is composed by the module electric circuit, including each kind of integrated block, logical component, simple electronic device for foundation simple digital frequency meter. Has realized the frequency and the cyclical survey, at the same time, this design also used the expander to expand the survey scope. And, the integrated circuit which uses to this design in, as well as in the simple digital frequency meter debugging has given the simple explanation. Key words: frequency meter；integrated circuit；Frequency Divider； Decoder；steady trigger 目 录 摘要…………………………………………………………………………………………… = 1 \* ROMAN I Abstract……………………………………………………………………………………… = 2 \* ROMAN II 前言…………………………………………………………………………………………… 1 1 数字频率计测量的基本原理…………………………………………………………… 2 1.1 数字频率计测频率的基本原理………