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提出了一种血氧饱和度检测集成电路的低功耗设计新方法,采用先电流滤波再对数放大的前端处理思路简化电路结构、降低功耗,在相同检测条件下,使LED驱动脉冲电流占空比从原来的3%降为0.3%甚至更低,使占检测系统功耗主要部分的LED模块功耗降为原来的1/10甚至更低。检测电路包括电流滤波器、对数跨阻放大器、电流模比值运算电路。仿真结果表明,在1.8V电源电压下,输入电流为2.7～15μA时,芯片总消耗电流仅为22～80μA。
A new method of low power consumption design for the oxygen saturation detection integrated circuit is proposed. The front-end processing idea of first logarithmic amplification of current filtering is adopted to simplify the circuit structure and reduce the power consumption. Under the same detection conditions, the LED drive pulse current The duty cycle is reduced from 3% to 0.3% or less, reducing the power consumption of the LED module, which is the main part of the power consumption of the detection system, to 1/10 or even lower. The detection circuit includes a current filter, a logarithmic transimpedance amplifier and a current-to-analog ratio operation circuit. The simulation results show that the total current consumption of the chip is only 22 ~ 80μA when the input current is 2.7 ~ 15μA at 1.8V supply voltage.