一种简易电路特性测试仪设计

Design of a simple instrument of circuit properties

为了实现对基本放大电路的特性测量,设计了一种简易电路特性测试仪。该装置以STM32单片机为核心,通过控制FPGA和DA模块产生频率可控的正弦波,利用有效值检波模块检测放大电路输入输出电压,最后利用单片机计算相关参数,从而获得电路的输入电阻、输出电阻、幅频特性曲线、输出直流分量等信息。该检测仪还可以判断电路出现的故障并给出故障原因,对初学者深入理解基本放大电路的结构和特性参数测量方法具有重要的指导意义。

In order to measure the properties of basic amplifying circuits,a simple instrument has been designed.With an STM32 single-chip microcomputer as the controller,frequency controllable sinusoidal waves by controlling FPGA and the DA modules are generated.A RMS detection module is adopted to measure the input and output voltages of the amplifying circuit,and then a single-chip microcomputer is used to calculate relative parameters.Through this method,the input and output resistance,amplitude-frequency wave and output DC parameters can be achieved.Furthermore,the instrument can troubleshoot circuit problems and find out the reasons,which is important for beginners to understand the structures of the basic amplifying circuits and measuring methods of their properties.