用于时域干涉系统的全差分平衡光电检测电路设计

Design of Fully Differential Balanced Photoelectric Detection Circuit for Time Domain Interference System

针对时域干涉系统的跨阻光电放大检测电路存在的直流分量和噪声干扰问题,分析了低相干时域信号的组成和跨阻光电放大电路的等效噪声模型,采用平衡探测器和全差分光电检测电路相结合,进行了电路器件选型和计算,完成全差分平衡光电探测电路的设计,并将其应用于生物测量仪的时域干涉系统信号的处理。实验结果表明,设计的电路可有效地抑制直流分量和噪声的影响,显著提高系统信号的质量。

Aiming at the problems of DC component and noise interference in the transimpedance photoelectric amplification detection circuit of the time domain interference system,the composition of the low-coherence time domain signal and the equivalent noise model of the transimpedance photoelectric amplification circuit were analyzed;and balanced detectors and fully differential photo-electricity were used.The detection circuit was combined to select and calculate the circuit device,complete the design of the fully differential balanced photoelectric detection circuit,and it was applied to the signal processing of the time domain interference system of the biometer.Experimental results show that the designed circuit can effectively suppress the influence of DC component and noise,and significantly improve the quality of the system signal.