一种高输出电压的增益带宽可调的程控放大器设计  

Design of a Programmable Gain Ampli fier with High Output Voltage and Adjustable Bandwidth

作　　者：赵中琦 崔鸣[1] 张新 ZHAO Zhongqi;CUI Ming;ZHANG Xin(School of Electronic Information Engineering,Suzhou Vocational University,Suzhou 215104,China;Department of Computer Science and Technology,Hefei University,Hefei 230601,China)

机构地区：[1]苏州市职业大学电子信息工程学院,江苏苏州215104 [2]合肥学院计算机科学与技术系,安徽合肥230601

出　　处：《苏州市职业大学学报》2020年第1期30-34,共5页Journal of Suzhou Vocational University

基　　金：江苏高校品牌专业建设工程资助项目(PPZY2015A089)。

摘　　要：以STM32F103RET6微控制器为核心,设计了一种实现高输出电压的增益带宽分别可调的放大器,并能够利用键盘设定系统的增益和截止频率,同时在LCD上显示出来。该设计由电压放大模块、频率采集模块、稳压模块、升压器模块以及STM32F103单片机控制和显示模块组成。整个系统增益在-34~46 dB范围内连续可调,最大输出电压峰峰值可达到±50 V;同时实现了任意设定系统的上限截止频率以及实时测量当前频率的功能。经测试,整个系统工作稳定,噪声小,在最大增益下系统的截止频率为10 MHz左右。Based on STM32F103RET6 microcontroller,this paper presents a programmable gain amplifier with high output voltage and adjustable bandwidth, which can use keyboard to set the gain and cut-off frequency of the system, and display it on LCD at the same time. This system consists of voltage amplifier module, frequency acquisition module, voltage regulator module,booster module and control and display module equipped with STM32F103RET6 microcontroller.The system can adjust the gain in the range of-34 to 46 dB continuously. The maximum peak output voltage of the system can reach ±50 V by raising the voltage through the booster circuit. At the same time, the microcontroller combines with the frequency sampling module to realize the function of arbitrarily setting the upper cut-off frequency of the system and real-time measuring the current frequency. After testing, the whole system works stably with low noise, and the cutoff frequency of the system is about 10 MHz at the maximum gain.

关 键 词：程控放大器 带宽可调 高输出电压 截止频率 

分 类 号：TN722[电子电信—电路与系统]