毕业设计---VHDL语言设计的数字频率计

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1、 摘摘 要要 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。本文阐述了用 VHDL 语言设计了一 个简单的数字频率计的过程。 关键字；频率计 VHDL 语言 Abstract I

2、n electronics, the frequency is the most basic parameters, and one with many electric parameter measurement systems, measurement results are very close relations, and therefore frequency measurement becomes even more important. There are many methods of measuring frequency, including electronic coun

3、ter measure frequency with high precision and easy, measurement, and is easy to realize rapid measuring process automation etc, and is one of the important methods of frequency measurements. Electronic counters frequency measurement there are two ways: one is the direct frequency measurement method,

4、 that is, in a certain gate time measurement is measured signal pulse number, 2 it is indirect frequency measurement method, such as periodic frequency measurement method. Direct frequency measurement method for high-frequency signal frequency measurements, indirect measuring frequency act applies to low frequency signal frequency measurements. This paper expounds with VHDL language design a simple digital frequency meter process. Key word： Frequency meter VHDL language. 目录目录 概述概述 第第 1 1 章章