简易数字频率计的设计与仿真

Design and Simulation of a Simple Digital Frequency Meter

简易数字频率计主要由前端采集处理模块、计数控制模块和显示模块组成。输入信号通过可调放大电路放大,有源低通滤波器滤波选频,电压比较器整形后,给计数控制模块计数,进行测频,并通过显示模块显示其测量频率的大小。仿真结果表明:该数字频率计实现了自动测频、自动清零、数据显示和保持功能,具有成本低,性价比高的优势。

The simple digital frequency meter is mainly composed of front-end acquisition and processing module,count control module and display module.The input signal is amplified by the adjustable amplifier circuit,the active low pass filter filter selection,the voltage comparator is shaped,the counting control module is counted for frequency measurement,and the size of the measurement frequency is displayed through the display module.The simulation results show that the digital frequency meter realizes the automatic measurement frequency,automatic clearing zero,data display and data-keeping,and has the advantages of low cost and high cost performance.