| 基于FPGA的硅电容传感器调理模块设计 |
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| 引用本文： | 庞士信,王超,匡石.基于FPGA的硅电容传感器调理模块设计[J].仪表技术与传感器,2010(10). |
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| 作者姓名： | 庞士信 王超 匡石 |
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| 作者单位： | 沈阳工业大学;沈阳仪表科学研究院; |
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| 摘 要： | 差动式硅电容传感器应用广泛,对差动电容信号的检测调理至关重要.文中以FPGA芯片为核心,其产生的正弦载波信号用于调制差动电容信号的变化,已调信号再次输入FPGA进行互相关解调及数字滤波后,得到反映差动电容变化的电容差信号,然后经非线性补偿,可以输出非线性度小于0.1%的数字信号.这样避免了采用模拟电路容易受到外界干扰,且提高了动态检测的速度和非线性补偿的精度.
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| 关 键 词： | 差动电容 FPGA 调理模块 非线性 |
Design of Silicon Capacitive Sensors Conditioning Module Based on FPGA |
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| PANG Shi-xin,WANG Chao,KUANG Shi.Design of Silicon Capacitive Sensors Conditioning Module Based on FPGA[J].Instrument Technique and Sensor,2010(10). |
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| Authors: | PANG Shi-xin WANG Chao KUANG Shi |
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| Affiliation: | PANG Shi-xin1,2,WANG Chao1,KUANG Shi2(1.Shenyang University of Technology,Shenyang 110870,China,2.Shenyang Academy of Instrumentation Science,Shenyang 110043,China) |
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| Abstract: | With differential silicon capacitance sensor is widely used in industries,so the detection and conditioning of the differential capacitance signal is essential.This paper took FPGA chip as the core,it produced a sinusoidal carrier signal to modulate the changing of differential capacitance signal.Modulated signal re-enter the FPGA and got the capacitance difference of reflecting change of the differential capacitance by cross-correlation demodulating and digital filtering.Then,after the differential capacit... |
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| Keywords: | differential capacitance FPGA conditioning module nonlinearity |
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