一种适用于Buck型DC/DC变换器的高精度片上电流采样电路  

Integrated High-accuracy On-chip Current Sensing Circuit for Current-mode Control CMOS DC-DC Buck Converter

作　　者：吴了[1] 郭苗苗[1] 

机构地区：[1]湖南大学计算机与通信学院,湖南长沙410082

出　　处：《微电子学与计算机》2011年第6期46-50,共5页Microelectronics & Computer

摘　　要：电流采样电路作为电流控制的DC/DC变换器重要组成部件之一,其精度和响应速度已受到越来越高的重视.提出的电流采样电路没有使用运算放大器,简化了电路结构,降低了功耗.同时,电路中引入的补偿电流进一步提高了采样的精度.基于0.5μm CMOS工艺实现该电路,HSPICE模拟仿真结果表明该电路具有较高的采样精度,最高可达99.9%,且在负载、输入电压、温度变化时,采样精度波动很小.Current sensing circuit is one of the most important component parts of current-control DC/DC convertor,its accuracy and response speed acquires more and more attention.We proposed a novel current sensing circuit in this paper,which does not use the operational amplifier,simplify the circuit structure,reducing power consumption,at the same time,the introduction of the compensation current further improves the sensing accuracy.Designed the circuit based on 0.5 μm CMOS process,HSPICE simulation results show that the circuit has a high sensing accuracy up to 99.9%,and as workload,input voltage and temperature changes,the fluctuation of sensing accuracy of the circuit is very small.

关 键 词：DC/DC 电流控制 电流采样 响应速度 高精度 稳定 

分 类 号：TN432[电子电信—微电子学与固体电子学]