一种高精度CMOS库仑计的设计  

Design of a High Accuracy CMOS Coulomb Meter

作　　者：杨洁[1] 曾云[2] 杨艳军[2] 

机构地区：[1]遵义师范学院物理与机电工程学院,贵州遵义563002 [2]湖南大学物理与微电子科学学院,长沙410082

出　　处：《微电子学》2015年第2期188-191,共4页Microelectronics

基　　金：贵州省教育厅自然科学研究项目(黔教合KY字[2013]200号);省级重点学科资助项目(黔学位办[2013]18号);贵州省科技厅科学技术基金资助项目(黔科合丁字LKZS[2014]27号)

摘　　要：针对移动电子设备对锂电池库仑计的特殊要求,基于上华0.5μm工艺,设计了一种电源电压范围为2.9~4.3V的CMOS库仑计。在电阻串实现分压方面,采用了短接到地和直接选择相结合的方法,使得分压精度更加线性化,能够实时、准确地反映电量。比较器方面,在两相不交叠时钟的控制下,将电阻分压后的电池电压由高到低逐次进行比较,可抵消失调。最终电池放电测试结果表明,测试结果与理论相符。In order to meet the special requirements of lithium battery coulomb meter on mobile electronic devices,a CMOS coulomb meter with a supply voltage range from 2.9Vto 4.3Vwas designed based on the CSMC0.5μm process.Voltage dividing of the resistor string was achieved through the shorted to ground method combined with the directly selection method.The voltage dividing accuracy was more linear,and the electric quantity could be measured accurately in real time.After divided by resistors,the battery voltage was compared successively in descending order by the comparators under the control of the two-phase non-overlapping clocks,so the offset was cancelled.The discharging of the battery had been tested,and the results showed that the test values corresponded to the theoretical values.

关 键 词：库仑计 电阻分压 比较器 

分 类 号：TN432[电子电信—微电子学与固体电子学]