A capacitive liquid level sensor interface application specitic integrated circuit for new carrier rocket

Wei CHEN; Cheng HUANG; Yao QIN; Guo-rui ZHANG; Liang YIN

doi:10.3788/OPE.20182604.0875

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A capacitive liquid level sensor interface application specitic integrated circuit for new carrier rocket

Micro/Nano Technology and Fine Mechanics | 更新时间：2020-07-05

- A capacitive liquid level sensor interface application specitic integrated circuit for new carrier rocket
- Optics and Precision Engineering Vol. 26, Issue 4, Pages: 875-883(2018)
- 作者机构：
  
  1.上海航天设备制造总厂, 上海 200245
  2.哈尔滨工业大学MEMS中心, 黑龙江哈尔滨 150001
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20182604.0875
  CLC： TP212.9
- Received：09 August 2017，
  
  Accepted：05 September 2017，
  
  Published：25 April 2018
- 稿件说明：
移动端阅览
Wei CHEN, Cheng HUANG, Yao QIN, et al. A capacitive liquid level sensor interface application specitic integrated circuit for new carrier rocket[J]. Optics and precision engineering, 2018, 26(4): 875-883.
DOI：

Wei CHEN, Cheng HUANG, Yao QIN, et al. A capacitive liquid level sensor interface application specitic integrated circuit for new carrier rocket[J]. Optics and precision engineering, 2018, 26(4): 875-883. DOI： 10.3788/OPE.20182604.0875.

摘要

为了提高新型航天运载火箭中电容式液位传感器系统的电容检测性能，设计了一款适用于航天运载火箭中电容式液位传感器的接口专用集成电路（Application Specitic Integrated Circuit，ASIC）芯片。首先，完成了整体电路的系统级设计，实现了对电容式液位传感器输出电容的线性检测，将传感器输出电容量转化为与之呈线性关系的电压量输出。然后，对接口ASIC芯片的线性度、噪声特性和温度环境适应性进行了理论分析与研究。最后，采用0.5

m CMOS工艺完成接口ASIC的流片，并进行了芯片的性能测试。实际测试结果显示，芯片电容检测非线性为0.005%，输出噪声密度3.7 aF/

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http://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=1853506&type=small

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（待测电容40 pF），电容测量稳定性7.4×10

-5

pF（参考电容40 pF，待测电容40 pF，1 σ，1 h），输出零位温度系数4.5

V/℃。测试结果证明，该接口ASIC的电容检测性能已经达到国外最高性能的电容式液位传感器液位测量芯片的水准，可以广泛应用到多种电容式检测传感器中。

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

which 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 characteristics and temperature environment adaptability of interface ASIC were analyzed and studied. At last

the interface ASIC was fabricated in a standard 0.5

m 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

-5

pF(when 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

V/℃. 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

Keywords

references

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