摘要
以信号调理技术为基础,设计了一款宽频带低噪声水声通用测量放大器,该测量放大器作为水听器的第一级测量放大器,可以对水声微弱信号进行放大,提高水声信号的测量信噪比,对后级滤波和接收处理起到重要的作用。测量放大器使用孪生JFET场效应管作为输入前级,实现阻抗变换的同时大大降低由于JFET差异性造成的偏置噪声。通过多级串联实现高增益放大,其最大增益110 dB,增益动态范围−30~110 dB,工作带宽为1 Hz~200 kHz,等效输入噪声小于5 nV/√Hz,并可通过RS232总线对增益档位进行控制。测量放大器具有增益档位灵活可调、频带宽、噪声低、线性度高及通用性强等的特点。通过与国外同类型测量放大器进行测试比对,测试结果表明,该测量放大器满足设计技术指标要求,与国外同类型仪器性能相当,并在实际工作应用中取得了良好的效果。
This paper presents the design of a broadband,low-noise underwater acoustic general-purpose measurement amplifier,based on signal conditioning technology.Serving as the primary stage amplifier for hydrophones,it amplifies weak underwater acoustic signals,thereby enhancing the signal-to-noise ratio essential for subsequent filtering and processing stages.The design features twin JFET field-effect transistors in the input stage to optimize impedance conversion and minimize bias noise.The amplifier boasts a high gain capability,with a maximum of 110 dB,a dynamic gain range of−30 to 110 dB,operating bandwidth from 1 Hz to 200 kHz,and equivalent input noise below 5 nV/√Hz.Gain levels can be controlled via an RS232 bus.Key attributes include adjustable gain stages,broad bandwidth,low noise,high linearity,and versatility.Comparative tests with similar foreign amplifiers confirm that this design fulfills technical specifications,delivering performance on par with international counterparts and demonstrating efficacy in practical applications.
作者
焦海波
解鹏飞
王家恒
何荣昌
JIAO Haibo;XIE Pengfei;WANG Jiaheng;HE Rongchang(Hangzhou Applied Acoustics Research Institute,Hangzhou 311400,China)
出处
《计量科学与技术》
2023年第11期3-9,70,共8页
Metrology Science and Technology
基金
国家重点研发计划(2016YFF0200905)。
关键词
计量学
信号调理
放大模块
频率特性
线性度
低噪声
metrology
signal conditioning
amplification module
frequency characteristics
linearity
low noise
作者简介
焦海波(1986-),杭州应用声学研究所工程师,研究方向:水声测试仪表研究,邮箱:sinahouse@foxmail.com。
