基于fpga的数字频率计设计本科论文

目录摘 要............................................................................................................................................IABSTRACT................................................................................................................................II前 言..............................................................................................................................................11、 FPGA 及 VHDL.........................................................................................................................21.1 FPGA 简介...................................................................................................................21.2 VHDL 概述..................................................................................................................22、 数字频率计的设计原理.......................................................................................................32.1 设计要求.....................................................................................................................32.2 频率测量....................................................................................................................32.2.1 时间门限测量法.........................................................................................32.2.2 标准频率比较测量法.................................................................................32.2.3 等精度测量法................................................................................................42.3 方案提出及确定.........................................................................................................42.4 系统设计与方案论证.................................................................................................52.5 小结.............................................................................................................................63、 频率计层化设计方案............................