Design of voltage-controlled resistor based on JFET and its application in automatic weather station signal simulator

被引：0

作者：

Xing, Hongyan ^{[1
,2
]}

Zhao, Chen ^{[1
,2
]}

Yu, Bingying ^{[1
,2
]}

Xu, Wei ^{[1
,2
]}

机构：

[1] Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science & Technology, Nanjing,210044, China

[2] Jiangsu Key Laboratory of Meteorological Observation and Information Processing, Nanjing University of Information Science & Technology, Nanjing,210044, China

来源：

Yi Qi Yi Biao Xue Bao/Chinese Journal of Scientific Instrument | 2015年 / 36卷 / 08期

关键词：

SPICE - Drain current - Resistors;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

According to the mechanism that the drain-source channel resistance of JFET transistor in the linear region is controlled by the gate-source voltage, the current formula of JFET is deduced, the performance of the variable resistor is analyzed. The PSpice software is used to simulate the JFET voltage controlled variable resistor, and the method for improving the nonlinearity of the JFET variable resistor and expanding its dynamic range is proposed. Based on above, combining single chip computer and D/A converter with JFET, a programmable JFET variable resistor was designed. The resistance range of the designed variable resistor is 75.703~141.004Ω, and the resolution is below 0.025Ω, which meets the requirements of the resistance range of 80.305~130.894Ω and resolution below 0.03Ω for the temperature channel of automatic weather station signal simulator. This variable resistor provides a standard variable resistor signal for the verification of the temperature channel of data collectors. ©, 2015, Science Press. All right reserved.

引用

页码：1884 / 1891