一种三极管放大电路参数及故障测试装置的设计

Design of A Triode Amplifier Circuit Parameters and Fault Measuring Device

提出一种三极管放大电路参数及故障测试装置,其由特定放大器和电路特性测试模块为主,配合相应的DDS信号源、AD采集模块、12846液晶显示模块和MSP430单片机模块组成。在整个电路系统中,主要包含信号发生模块、信号隔离模块、增益放大模块、AD811模块。由信号发生器输出频率1 kHz幅值1 V的正弦信号,通过电阻分压输出10 mV的正弦信号,经过起阻抗变换和隔离作用的电压跟随器,把该电压信号隔离后送入AD637转化为有效值,最后再经过AD转化成数字量,并在MSP430单片机内计算得到输入电阻、输出电阻、放大倍数和幅频特性曲线,所有结果也均可在12846液晶屏上显示。

This paper presents a transistor amplifier circuit parameters and fault test device,which is mainly composed of specific amplifier and circuit characteristic test module,together with corresponding DDS signal source,AD acquisition module,12846 LCD module and MSP430 MCU module.In the whole circuit system,it mainly includes signal generation module,signal isolation module,gain amplifier module and AD811 module.The signal generator outputs the sinusoidal signal with frequency of 1kHz and amplitude of 1V,and obtains the sinusoidal signal with amplitude of 10 mV through resistance voltage divider.Then the voltage signal is isolated by voltage follower which plays the role of impedance transformation and isolation.After that,the voltage signal is sent to AD637 and converted into effective value.Finally,it is converted into digital quantity through AD,and the input resistance,output resistance and amplification are calculated in MSP430 MCU.All results can also be displayed on 12846 LCD.