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gao jing du wei ruo dian rong jian ce xi tong de she ji yu shi xian
Author(s): 
Pages: 44-47
Year: Issue:  8
Journal: Instrumentation Technology

Keyword:  微弱电容电容数字转换器检测电路;
Abstract: 针对微弱电容信号的测量问题,提出了一种基于AD7746芯片的高精度微弱电容检测系统。AD7746芯片是ADI公司推出的24位高精度电容数字转换器,测量可变电容范围为±4 pF,可通过在片可编程补偿设置0~17 pF的共模电容偏置,具有两组电容输入通道。系统采用屏蔽电缆、电容器两层屏蔽等措施,减小寄生电容,抑制电磁干扰,实现宽范围高精度测量。经过多次试验表明,该检测系统具有很好的测量精度和重复性,最差电容测量(采用自制电容传感器的情况下)输出误差≤±1 fF。
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