基于FPGA的增益可调微弱信号采集系统设计
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摘要
针对以往采集电路中放大倍率固定,适用的采集环境单一,不可灵活调理实际微弱信号的现状,设计了基于FPGA的增益可调微弱信号采集系统,该系统以FPGA为核心,以集成运算放大器OP37G,模拟开关DG611DY组成增益可调放大电路,具备了×0.5,×2,…,×100,×200等10种放大倍率可编程控制的功能,以高精度模数转换芯片AD7865为采集芯片,实现了高精度微弱信号的采集。试验结果表明:系统在多种微弱信号环境下经增益电路放大后,各通道采样精度均能达到0.1%。系统可灵活应用于多种微弱信号采集环境,稳定可靠,已成功应用于某微弱信号测试场合。
Aiming at the current situation that the amplification ratio of the previous acquisition circuit was fixed, the applicable acquisition environment was single, and the actual weak signal cannot be flexibly conditioned, a gain-adjustable weak signal acquisition system based on FPGA was designed. The system used FPGA as the core, integrated operational amplifiers OP37 G and analog switches DG611 DY to form a gain-adjustable amplification circuit, which had 10 kinds of programmable control functions such as × 0.5, × 2... ×100, ×200, etc. and used the high-precision analog-digital conversion chip AD7865 as the acquisition chip to realize the acquisition of high-precision weak signals. The experimental results show that the sampling accuracy of each channel can reach 0.1 % after the system is amplified by gain circuit in various weak signal environments. The system can be flexibly applied to various weak signal acquisition environments, is stable and reliable, and has been successfully applied to a weak signal testing occasion.
Aiming at the current situation that the amplification ratio of the previous acquisition circuit was fixed, the applicable acquisition environment was single, and the actual weak signal cannot be flexibly conditioned, a gain-adjustable weak signal acquisition system based on FPGA was designed. The system used FPGA as the core, integrated operational amplifiers OP37 G and analog switches DG611 DY to form a gain-adjustable amplification circuit, which had 10 kinds of programmable control functions such as × 0.5, × 2... ×100, ×200, etc. and used the high-precision analog-digital conversion chip AD7865 as the acquisition chip to realize the acquisition of high-precision weak signals. The experimental results show that the sampling accuracy of each channel can reach 0.1 % after the system is amplified by gain circuit in various weak signal environments. The system can be flexibly applied to various weak signal acquisition environments, is stable and reliable, and has been successfully applied to a weak signal testing occasion.
引文
[1] 胡晓峰.堆叠式微型数据采集系统关键技术研究[D].太原:中北大学,2017.
[2] 关云飞.基于FPGA的差动像散离焦信号的检测和处理技术[D].哈尔滨:哈尔滨工程大学,2012.
[3] 张焱.水下航行器中多通道采编存储器的研制[D].太原:中北大学,2015.
[4] 武晓栋,郑宾,崔婧,等.基于FPGA的混合编帧的高速采集系统[J].伺服控制,2014(2):51-53.
[5] 郭涛,魏明明,王超.便携式无线倾角传感器测量系统的设计[J].仪表技术与传感器,2016(8):5-8;13.
[6] 王帅.基于FPGA的数据采集模块设计[D].贵阳:贵州大学,2015.
[7] 后盾.信号完整性分析及其在高速数字电路设计中的应用[D].杭州:浙江大学,2004.
[8] 郭佳欣.基于LVDS的图像采集存储装置的设计与实现[D].太原:中北大学,2017.
[9] 褚建平.遥测振动及冲击数据谱分析卡设计与实现[D].太原:中北大学,2017.
[10] 王培人.数据采集器的FLASH存储技术与实现[D].哈尔滨:哈尔滨工程大学,2016.
[2] 关云飞.基于FPGA的差动像散离焦信号的检测和处理技术[D].哈尔滨:哈尔滨工程大学,2012.
[3] 张焱.水下航行器中多通道采编存储器的研制[D].太原:中北大学,2015.
[4] 武晓栋,郑宾,崔婧,等.基于FPGA的混合编帧的高速采集系统[J].伺服控制,2014(2):51-53.
[5] 郭涛,魏明明,王超.便携式无线倾角传感器测量系统的设计[J].仪表技术与传感器,2016(8):5-8;13.
[6] 王帅.基于FPGA的数据采集模块设计[D].贵阳:贵州大学,2015.
[7] 后盾.信号完整性分析及其在高速数字电路设计中的应用[D].杭州:浙江大学,2004.
[8] 郭佳欣.基于LVDS的图像采集存储装置的设计与实现[D].太原:中北大学,2017.
[9] 褚建平.遥测振动及冲击数据谱分析卡设计与实现[D].太原:中北大学,2017.
[10] 王培人.数据采集器的FLASH存储技术与实现[D].哈尔滨:哈尔滨工程大学,2016.