一种适用于LDO的动态频率补偿方案  

A Dynamic Frequency Compensation Scheme for LDO

作　　者：王松林[1] 罗莉[1] 来新泉[1] 李磊[1] 

机构地区：[1]西安电子科技大学电路CAD研究所,西安710071

出　　处：《电子器件》2008年第4期1273-1275,1279,共4页Chinese Journal of Electron Devices

基　　金：国家自然科学基金资助项目(60172004);西安应用材料创新基金资助项目(XA-AM-200504)

摘　　要：设计了一种应用于低压差线性稳压器(LDO)中的新型误差放大电路,其核心部分采用对称性的差分运算跨导(OTA)结构;通过动态零点频率补偿技术,显著改善了其性能指标;采用Hynix0.5μm CMOS模型进行仿真,结果表明,当负载电流由1mA变化至300mA时,系统环路增益的0dB带宽保持在70kHz到100kHz之间,相位裕度保持在60o以上,保证了LDO稳压器在全负载范围内均能稳定工作。A novel error amplifier for LDO is designed. The core circuit is symmetrical differential OTA. By using dynamic zero frequency compensation technique, the performance is improved dramatically. Simulated with the Hynix 0. 5μm CMOS model, it is proved that the 0 dB bandwidth of the system is between 70 kHz and 100 kHz, phase margin is over 60° with the load current varying from lmA to 300mA, and the LDO regulator could operate stably at all loads.

关 键 词：电源管理 低压差线性稳压器 误差放大器 频率补偿 

分 类 号：TN715.2[电子电信—电路与系统]