光学精密工程2018，Vol.26Issue(4)：875-883,9.DOI:10.3788/OPE.20182604.0875
新型运载火箭中电容式液位传感器接口专用集成电路
A capacitive liquid level sensor interface application specitic integrated circuit for new carrier rocket
摘要
Abstract
In order to improve the capacitance detection performance of capacitive liquid level sensor in new aerospace carrier rocket,an interface(Application Specitic Integrated Circuit)ASIC of capacitive liquid level sensor in aerospace carrier rocket was designed.First,the system of the whole circuit was designed,w hich converted the output capacitance of capacitive liquid level sensor to voltage that had linear relationship with the output capacitance of the sensor.And then,the linearity,noise character-istics and temperature environment adaptability of interface ASIC were analyzed and studied.At last, the interface ASIC was fabricated in a standard 0.5 μm CMOS process and the performances of the chip were tested.The test results show that the linearity of capacitance detection of the ASIC is 0.005%,output noise is 3.7 aF/(when the capacitance which will be detected is 40 pF),the stability of capacitance detection is 7.4× 10-5pF(w hen the reference capacitance is 40 pF,the capacitance which will be detected is 40 pF,1 σ,1 h),the output zero position temperature coefficient is 4.5 μV/℃.The test results prove that the capacitance detection performance of the ASIC reaches the standard of capacitive liquid level sensormeasurement chip with the highest performance abroad, which can be widely used in many kinds of capacitive detection sensors.关键词
电容式液位传感器/微弱电容检测/接口ASIC芯片/开关电容电路Key words
capacitive liquid level sensor/weak-capacitance detection/interface Application Specitic In-tegrated Circuit(ASIC)/switched-capacitor circuits分类
信息技术与安全科学引用本文复制引用
陈威,黄诚,秦尧,张国瑞,尹亮..新型运载火箭中电容式液位传感器接口专用集成电路[J].光学精密工程,2018,26(4):875-883,9.基金项目
上海航天科技创新基金资助项目(No.SAST2015052) （No.SAST2015052）
