摘要
利用运算放大器和数模转换器等电路构成单口网络,通过编程得到输入电压及电流的比值,获得期望大小的合成电阻。这种合成电阻可以用于对电阻类传感器的测试电路或仪器的自动校准。提出了在提高电阻合成准确度、扩展桥压范围、提高极性适应能力和多通道之间的隔离等方面的解决办法,并对实验结果进行了分析,给出了实用的修正方法。
A synthesized resistor can be achieved by a single port network,which is constructed by operational amplifiers and a digital to analog converter,because the ratio of input voltage and current can be controlled by programming.Such synthesized resistors can be applied in measuring circuet and automatic calibration for instruments of resistor-type sensors.Several key problems of resistor synthesis are studied: how to improve the accuracy of synthesized resistor,how to expand the voltage scope of resistor's application circuits,how to make the synthesis circuits adapted for positive or negative voltage and how to develop a multi-channel synthesis circuits in one board.The experimental results are also discussed,and therefore a practical revised method is given.
出处
《传感器技术》
CSCD
北大核心
2004年第10期53-55,59,共4页
Journal of Transducer Technology
基金
航空科学基金资助项目(01C2015)
