【摘要】 为了确保植入式眼压传感器在体内长期保持稳定的工作状态,同时能较为精准地反映人体眼压变化,设计了一种应用于青光眼治疗的植入式眼压检测传感器的10bit,20kS/s低功耗逐次逼近型数字模拟转换器(SAR ADC).该电路内置的DAC使用全电容阵列设计,利用对称电容阵列结构提高缩放电容的匹配精度;比较器采用三级预放大器加一级动态锁存器结构,并引入了失调校准功能.电路采用SMIC 0.18μm 1P6M工艺进行设计,后仿真结果表明,在20kS/s的采样速率下,有效位数可达9.4bit,平均功耗仅为44.7μW.更多还原

【Abstract】 In order to ensure the long-term stable working state and detection resolution of implantable intraocular pressure sensor,a 10 bit,20 KS/s low power successive approximation analog to digital converter(SAR ADC)for implantable intraocular pressure detection sensor application is proposed in this paper.The DAC adopts a full capacitance array design.The symmetrical capacitor array structure improves the matching accuracy of the scaling capacitor;Comparator with three-stage pre-amplifier and dynamic latch structure ensures the offset calibration function.The circuit is implemented with SMIC 0.18μm CMOS technology and the post-simulation results show that the effective number of bits(ENOB)can reach 9.4 bit at 20 KS/s sampling rate,and the average power consumption is only 44.7μW.更多还原