电容传感器变频差动数字检测电路研究
Variable Frequency Differential Capacitance Sensor Digital Detection Circuit

作者: 胡明安 , 王明灼 * , 汪 寅 , 王小娟 , 陈 辉 :四川理工学院,四川 自贡;

关键词: 变频检测电路传感器差动电路稳频Variable Frequency Detection Circuit The Sensor Differential Circuit Frequency Stabilization

摘要:
在差动对称式变频检测电路(DFCT)的分析基础上,设计了两种数字式对称差动变频检测集成电路,讨论了设计电路的特点。对设计出的分立元件多谐振荡数字式对称差动变频检测电路进行了试验,试验结果表明:对变间隙式电容传感器,不论是振荡的输出频率,还是两者的差频都是完全成线性输出的,输出的灵敏度达到0.084 μm/Hz。

Abstract: Based on the analysis of the differential symmetric frequency detection circuit (DFCT), two kinds of digital symmetric differential frequency detection integrated circuit are designed, and the characteristics of the circuit are discussed. The discrete component design digital symmetric differential of the resonance oscillation frequency detection circuit was tested. The results showed that for variable gap capacitive sensor, whether its output frequency of vibration or its subtraction of frequency is completely linear output. The output sensitivity reaches 0.084 μm/Hz.

文章引用: 胡明安 , 王明灼 , 汪 寅 , 王小娟 , 陈 辉 (2017) 电容传感器变频差动数字检测电路研究。 应用物理, 7, 14-20. doi: 10.12677/APP.2017.71003

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