High Precision Low Temperature Coefficient Current Reference with Resistor Compensation
In order to improve temperature characteristics and precision of current reference,a novel resistor compensated current reference based on bandgap voltage reference with trimming network is proposed in this paper.By introducing the combination of 2nd order resistor and transmission gate whose temperature characteristics compensate that of bandgap voltage reference,lower temperature coefficient has been achieved.This circuit is implemented using HHNEC 0.35um BCD process with 3.3V power supply.Simulation results for the proposed current reference show the worst temperature coefficient of 15.25ppm/ ℃ and the best temperature coefficient of 5ppm/ ℃ over a temperature range from-45 ℃ to 85 ℃.With trimming network,an output current variation of 1.4%.is achieved among process corners.On the premise of not introducing high-order curvature compensated to bandgap which increase circuit complexity,this circuit put forward a new thought for the design of current reference.
Current reference Resistor compensation Trimming network Temperature coefficient
Xiaoning Xin Bingyin Luo
School of Information Science and Engineering Shenyang university of technology, shenyang, 110870,China
国际会议
沈阳
英文
1275-1279
2012-07-27（万方平台首次上网日期，不代表论文的发表时间）