文章摘要
罗德猛,徐海东,胡长青,孙东飞.一种可用于自容式水听器的信号采集电路设计[J].声学技术,2023,42(3):306~313
一种可用于自容式水听器的信号采集电路设计
A design of signal acquisition circuit for self-contained hydrophone
投稿时间:2021-09-24  修订日期:2021-12-06
DOI:10.16300/j.cnki.1000-3630.2023.03.006
中文关键词: 自容式数据采集  嵌入式可拓展处理平台  全差分  低功耗
英文关键词: self-contained data acquisition  embedded extensible processing platform  fully differential  low power consumption
基金项目:
作者单位E-mail
罗德猛 中国科学院声学研究所东海研究站, 上海 201815
中国科学院大学, 北京 100049 
 
徐海东 中国科学院声学研究所东海研究站, 上海 201815 xhd@mail.ioa.ac.cn 
胡长青 中国科学院声学研究所东海研究站, 上海 201815
中国科学院大学, 北京 100049 
 
孙东飞 中国科学院声学研究所东海研究站, 上海 201815  
摘要点击次数: 328
全文下载次数: 593
中文摘要:
      针对自容式水听器低功耗、低噪声等需求,设计了一种自容式的水声信号采集电路。在模拟电路部分,为了提高信噪比、降低功耗,使用了二端口噪声分析和全差分设计,并将模拟电路的工作电压降至3 V;为了削减1/f噪声和高频无关噪声,组合使用了贝塞尔滤波器和切比雪夫滤波器。在数字电路部分,使用ZYNQ可拓展处理平台代替传统的微控制器(Micro Control Unit,MCU)与现场可编程门阵列(Field Programmable Gate Array,FPGA),并根据工作频带通过配置锁相环(Phase Locked Loop,PLL)锁相环的工作频率调节采样频率,使用双先入先出队列(First In First Out,FIFO)块向外置记忆卡(Trans Flash,TF)卡写入数据,使数字信号以较高速率传输并存储。经过仿真和测试,模拟电路在60 Hz~58 kHz之间的增益达到52 dB。实测结果显示,模拟电路部分的功耗为95 mW,数字电路部分的功耗为1.9 W;在模数转换(Analog/Digital,A/D)芯片采样率达到128 kHz时,电路自噪声频谱略高于-110 dB,总噪声均方根为961 μV。该采集系统配合大容量的TF卡,可以满足自容式水听器长时间连续采集声信号的需求。
英文摘要:
      To meet the requirement for low power consumption, low noise and wide band, a self-contained underwater acoustic signal acquisition circuit is designed. In order to improve the signal to noise ratio (SNR) and reduce power consumption, two-port noise analysis and fully differential design are used in analog circuit, and the operating voltage of the analog circuit is reduced to 3 V. Bessel filter and Chebyshev filter are combined to reduce 1/f noise and high frequency irrelevant noise. In the digital circuit section, ZYNQ embedded extensible processing platform is used instead of traditional micro control unit (MCU) and field programmable gate array (FPGA). Phase locked loop (PLL) core is used to change the sampling frequency according to the operation frequency band, and double first in first out (FIFO) block is used to write data to trans flash (TF) card, so that the digital signal is transmitted and stored at a higher rate. By simulation, the analog circuit achieves a gain of 52 dB within 60 Hz to 58 kHz. The measured results show that the analog circuit power consumption is 95 mW, the digital circuit power consumption is 1.9 W; when the sampling rate of analog/digital (A/D) chip reaches 128 kHz, the self-noise spectrum of the circuit is slightly higher than -110 dB, and the root mean square (RMS) of total noise is 961 μV. The acquisition system with large capacity TF card can meet the needs of self-contained hydrophone to collect acoustic signals continuously for a long period.
查看全文   查看/发表评论  下载PDF阅读器
关闭