摘要
分析了片上低压降(Low Dropout)电源调节器稳定性的极限条件,在此基础上,提出了一种实用的频率补偿技术。此技术无需额外电阻和偏置电压,即能为系统产生零点,实现系统的主、次极点分离(pole-splitting),从而增加相位裕量,使系统保持稳定。实验表明,采用该技术的电路结构简单、实现容易、占用面积小,能够使片上LDO在负载电阻、负载电容大范围变化的情况下保持稳定,特别适用于片上电源管理系统。LDO采用SMIC 0.18μm CMOS工艺实现。
The stability limit of on-chip LDO voltage regulator is analyzed and a practical frequency compensation technique is presented. The proposed scheme not only succeeds in pole-splitting, but also generates a zero internally without any extra resistors or bias voltages, which indeed helps increase system＇s phase margin and result in stability. It is demonstrated by experiments that this scheme is an easy-achieving, structure-reducing and area-saving one and it is capable of maintaining system stability within a wide range of load change, which makes it rather useful in the application of on-chip power management system. The proposed on-chip LDO is implemented in SMIC＇s 0. 18 μm CMOS process.
出处
《微电子学》
CAS
CSCD
北大核心
2007年第1期57-60,共4页
Microelectronics
关键词
频率补偿
片上低压降调节器
电源管理系统
Frequency compensation
Low dropout （LDO） regulator
Power management system
