应用于可穿戴脉搏血氧检测的G_m-C低通滤波器
发布时间：2018-11-19 09:08
【摘要】：为了解决可穿戴脉搏血氧检测芯片滤波器面积大、功耗高的问题,改进设计了一个三阶巴特沃斯G_mC低通滤波器.线性跨导器采用源极负反馈结构来增大线性范围,并且输入管工作在亚阈值区降低了功耗,然后通过密勒效应放大电容来减小面积;同时,该滤波器通过开关电容调谐电路调制滤波器的截止频率,降低工艺偏差.仿真结果表明:在SMIC 0.18μm CMOS工艺,1.8V电源电压供电下,该低通滤波器的截止频率为7.9Hz,面积为0.14mm~2,功耗为6.7μW,相比其他的设计方案,在功耗和面积上都有大幅优化.
[Abstract]:In order to solve the problem of large area and high power consumption of wearable pulse oximeter chip filter, an improved third-order Butterworth G_mC low-pass filter is designed. The linear transconductors use the source negative feedback structure to increase the linear range, and the input tube works in the sub-threshold region to reduce the power consumption, and then uses the Miller effect to amplify the capacitance to reduce the area. At the same time, the cut-off frequency of the filter is modulated by switched capacitor tunable circuit, and the process deviation is reduced. The simulation results show that under the SMIC 0.18 渭 m CMOS technology and 1.8 V power supply, the cut-off frequency of the low-pass filter is 7.9 Hz, the area is 0.14 mm / 2, and the power consumption is 6.7 渭 W, compared with other design schemes. There are significant optimizations in power consumption and area.
【作者单位】： 华中科技大学光学与电子信息学院;武汉工程大学电气信息学院;
【基金】：国家自然科学基金资助项目(61006028) 科技部科技型中小企业技术创新基金资助项目(14C26214422753) 湖北省重大科技资助项目(2015ACA063) 中央高校基本科研业务费资助项目(2014TS041)
【分类号】：TN713.4
[Abstract]:In order to solve the problem of large area and high power consumption of wearable pulse oximeter chip filter, an improved third-order Butterworth G_mC low-pass filter is designed. The linear transconductors use the source negative feedback structure to increase the linear range, and the input tube works in the sub-threshold region to reduce the power consumption, and then uses the Miller effect to amplify the capacitance to reduce the area. At the same time, the cut-off frequency of the filter is modulated by switched capacitor tunable circuit, and the process deviation is reduced. The simulation results show that under the SMIC 0.18 渭 m CMOS technology and 1.8 V power supply, the cut-off frequency of the low-pass filter is 7.9 Hz, the area is 0.14 mm / 2, and the power consumption is 6.7 渭 W, compared with other design schemes. There are significant optimizations in power consumption and area.
【作者单位】： 华中科技大学光学与电子信息学院;武汉工程大学电气信息学院;
【基金】：国家自然科学基金资助项目(61006028) 科技部科技型中小企业技术创新基金资助项目(14C26214422753) 湖北省重大科技资助项目(2015ACA063) 中央高校基本科研业务费资助项目(2014TS041)
【分类号】：TN713.4
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