This paper starts with a comprehensive analysis of the trade-offs among various performance parameters in conventional adaptively biased low dropout regulator (AB-LDO) and then proposes a new structure of output capacitor-less AB-LDO, employing recycling-folded-cascode(RFC) amplifier, to optimize the different trade-offs. With this special structure, the proposed AB-LDO finally achieves faster dynamic response, better linear and load regulation without increasing power consumption. In addition, cascode compensation is employed to bring a wider load range while ensuring loop stability. Finally, the proposed AB-LDO is implemented in 0.18$\mu$ m CMOS process and experimental results show that a low quiescent current (10–50.25$\mu$A), good load regulation of 0.48 mV/mA, undershoot of 92 mV and overshoot of 86 mV with high current efficiency of 99.95$\%$ have been achieved.

本文首先全面分析了传统自适应偏置低压降稳压器（AB-LDO）的各种性能参数之间的取舍，然后提出了一种采用循环折叠共源共栅的无输出AB-LDO的新结构（ RFC）放大器，以优化不同的取舍。通过这种特殊的结构，提出的AB-LDO最终实现了更快的动态响应，更好的线性和负载调节，而不会增加功耗。另外，采用共源共栅补偿可带来更大的负载范围，同时确保环路稳定性。最后，建议的AB-LDO在0.18中实现$\mu$ m CMOS工艺和实验结果表明，低静态电流（10–50.25$\mu$A），0.48 mV / mA的良好负载调节，92 mV的下冲和86 mV的过冲，具有99.95的高电流效率$％$ 已经实现。