1. 中国科学院 机构 微电子研究所,北京,100029
2. 中国科学院大学 机构,北京,101408
纸质出版:2020
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酒耐霞, 王立新. 一种宽电源电压快速响应的LDO设计[J]. 微电子学与计算机, 2020, 37(3): 20-25.
JIU Nai-xia, WANG Li-xin. LDO design for fast response of wide power supply voltage[J]. 2020, 37(3): 20-25.
基于0.35 μm工艺,设计了一种工作在15~30 V的宽电源电压的高电源抑制比(PSRR)、快速瞬态响应的线性LDO.该LDO主要包含电源电压预调节模块、基准源模块、误差放大器模块.电源电压预调节模块,降低输入电压波动范围,同时采用了PSRR增强电路,提高LDO的线性稳定性和PSRR;误差放大器模块,采用了一种带正反馈增益增强差分放大器电路,提高了电路的增益,同时采用双环反馈技术,提高LDO的瞬态响应速度.仿真结果表明:输出电压为5 V,PSRR低频时为128 dB,100 kHz时为60 dB,瞬态响应时间约为0.1 s.
Based on the 0.35 μm process
a high power supply rejection ratio (PSRR) and fast transient response linear LDO was designed.The LDO consists of a power supply voltage pre-regulation module
a reference source module and an error amplifier module.The power supply voltage pre-regulation module reduces the input voltage fluctuation range. Meanwhile
PSRR enhancement circuit is adopted to improve the linear stability of LDO and PSRR.The error amplifier module adopts a differential amplifier circuit with positive feedback gain to improve the gain of the circuit
and at the same time adopts double-loop feedback technology to improve the transient response speed of LDO.Simulation results show that the output voltage is 5 V
the PSRR low frequency is 128 dB
100 kHz is 60 dB
and the transient response time is about 0.1 s.
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