一种具有自动补偿功能的呼吸信号检测电路

目的：针对呼吸信号检测电路不能适应环境温度变化的不足，提出具有温度和电压双重补偿功能的电路呼吸信号检测电路。方法：该电路利用二极管的结电压随温度变化的特性实现呼吸信号的检测。结果：利用同型二极管的差分接入实现了自动温度补偿和自动电压波动补偿功能。结论：实验结果表明该电路对呼吸信号的检测基本不受环境温度变化和电压波动的影响，结构简单，提高了呼吸信号检测的准确度。

A Respiratory Signal Detection Circuit with Automatic Compensation Function

Objective To introduce a new kind of circuit with temperature and voltage double compensation function inview of the deficiency of ambient temperature change on existing respiratory signal detection circuit. Methods The respiratory signal is detected by the characteristics of diode junction voltage with temperature changes. Results The functions of automatic temperatures compensation and automatic voltage fluctuation compensation are realized with the differential connection of two identical diodes. Conclusion The experimental results shows that the proposed circuit is basically immune to the fluctuation of ambient temperature changes and voltage fluctuation, its structure is simple and the accuracy of breathing signal detection is also improved.[Ohinese Medical Equipment Journal,2009,30（3）：62--63,65]