近红外无创测量中的测量前放的噪声最优化设计

Optimum Design of Pre-Amplifier in NIR Non-Invasive Measurement

为了提高生物信号光学无创测量系统的信噪比,对光电测量前放电路I-V转换电路的噪声模型进行了详细的分析,理论分析了各个噪声源对系统的影响,根据其数学模型,构造出其优化设计的目标函数。将此目标函数应用到血氧饱和度无创测量系统中,提高了系统的信噪比。

To improve the signal noise ratio, the noise of preamplifier in optical measurement system, I-V convert circuit, was modeled. Effect of the noise sources on system was theoretically analyzed and an optimization object function was constructed. This optimization object function was applied to the blood oxygen saturation measurement system and a higher signal-noise ratio was achieved.