基于四级级联放大的程控微弱信号放大装置  

A Four-step Cascade Programmable Weak Signal Amplification Device

作　　者：李良杰 吕志刚[1] 冯晓岗[1] 王宾[1] 邸若海 LI Liangjie;LÜZhigang;FENG Xiaogang;WANG Bin;DI Ruohai(School of Electronics and Information Engineering, Xi'an Technological University, Xi'an 710021, China)

机构地区：[1]西安工业大学电子信息工程学院,陕西西安710021

出　　处：《探测与控制学报》2022年第2期85-91,共7页Journal of Detection & Control

基　　金：电子信息系统复杂电磁环境效应国家重点实验室基金资助(CEMEE2020Z0202B);陕西省自然科学基础研究计划项目资助(2020JQ-816)。

摘　　要：针对传统放大电路依靠手动调节增益带来的误差和不便,结合感应装定测试系统特点,提出基于四级级联放大的程控微弱信号放大装置。该装置由前置低噪声放大单元、单端转差分放大单元、DGA放大单元及差分转单端放大单元构成四级级联放大电路,利用串行通信协议及SPI通信协议完成对放大电路的控制。测试结果表明,该装置对带宽在10 Hz~100 MHz之间,最低幅值2 mV的微弱信号实现了20~60 dB程控增益不失真放大功能,为感应装定测试系统中对信号放大的需求提供了新的技术方案。Aiming at the error and inconvenience caused by the traditional amplifying circuit relying on manual gain adjustment,combined with the characteristics of the induction setting test system,a program-controlled weak signal amplifying device based on four-stage cascade amplification was proposed.The device consisted of a front low-noise amplifying unit,a single-ended to differential amplifying unit,a DGA amplifying unit and a differential to single-ended amplifying unit to form a four-stage cascaded amplifying circuit,the serial communication protocol and SPI communication protocol were used to control the amplifier circuit.The experimental results showed that the device could achieve a 20~60 dB programmable gain non-distortion amplification function for weak signals with a bandwidth between 10~100 MHz and a minimum amplitude of 2 mV.It provided a new technical solution of signal amplification for induction setting test system.

关 键 词：感应装定测试系统 程控放大器 多级信号放大 

分 类 号：TN911.71[电子电信—通信与信息系统]