摘要
提出了一种新型结构的高稳定性LDO线性稳压器。该电路采用基于轨至轨误差放大器的全反馈模式;设计了包括转换速率加强(SRE)电路的缓冲电路,并采用跨多级双密勒电容补偿方式。在Chartered 0.35μm CMOS工艺下进行仿真,结果表明:输出电压跟踪基准电压变化范围为GND～Vdd;在0～300 mA的电流负载下,开环电路相位裕度均不小于88°;负载电流从0 mA跳变到50 mA时,输出电压最大跳变值和环路响应时间分别为28 mV和0.5μs。用全反馈网络替代LDO的电阻反馈网络,提高了输出电压精度,减小了系统静态电流、噪声和面积。
An LDO linear regulator with high stability based on novel structure was presented.The circuit was designed with full feedback mode based on rail-to-rail error amplifier.A buffer stage including slew-rate enhanced（SRE） circuit was designed,and multi-stage stepping double Miller capacitor compensation method was adopted.Results from simulation based on Chartered 0.35 μm CMOS process showed that the circuit had an output voltage varying from GND to Vdd following reference voltage,and an open-loop phase margin not less than 88° at a load current from 0 to 300 mA.In addition,the circuit achieved a transient response with 28 mV voltage variation and 0.5 μs settling time for a 50 mA load step.The output voltage accuracy of the regulator was improved,and the quiescent current,as well as noise and area,of the system was reduced by using full feedback network,instead of resistance feedback network.
出处
《微电子学》
CAS
CSCD
北大核心
2011年第1期34-38,43,共6页
Microelectronics
基金
国家高技术研究发展(863)计划基金资助项目(2007AA012284)
