Design of Multi-channel High Precision Data Acquisition System Based on nA Level Current Signal
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摘要: 在大气成份和含量探测的傅里叶变换光谱探测技术中，红外探测器输出的电流信号一般极其微弱。本文针对电流信号频率为kHz级、电流强度在nA级的多元型红外探测器，通过分析系统噪声来源，选取高精度、低噪声的精密集成运算放大器，合理选取电路参数，设计了一种多通道微弱电流信号高精度采集电路。通过对电路性能进行分析，结果表明，该系统可以精确采集到nA级的1 kHz微弱电流信号，系统的噪声低，满足设计要求。Abstract: In the Fourier transform spectrum detection technology of atmospheric composition and content detection, the output current signal of infrared detector is generally very weak. In this paper, a multi-channel weak current signal high-precision acquisition circuit is designed by analyzing the source of system noise, using high-precision and low-noise integrated operational amplifier, and reasonably selecting circuit parameters. An analysis of the circuit performance shows that the system can accurately acquire the nA level 1kHz current signal, and meet the requirements of weak signal detection.
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Key words:
- weak signal /
- high-precision /
- low noise /
- data acquisition system
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图 1 微弱电流信号采集系统的总体方案
Figure 1. General scheme of weak current signal acquisition system
图 6 不同反馈电阻下的系统交流传输特性
Figure 6. AC transmission characteristics of systems with different feedback resistors
图 7 不同反馈电容下的系统交流传输特性
Figure 7. AC transmission characteristics of systems with different feedback capacitors
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