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如题所示。
关于AFE4490的计算可以参考TI design:
http://www.ti.com/tool/tida-00010
http://www.ti.com/lit/ug/tidu124/tidu124.pdf
根据测量原理,是要测出光电转换后红光和红外光交直流分量之比,再根据SPO2的定标曲线即可得到血氧饱和度的值