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A 245-mA Digitally Assisted Dual-Loop Low-Dropout Regulator
提出一种数字辅助双环路低压差稳压器,结合数字与模拟环路优势,实现高电源抑制比和快速响应。
245mA负载,-42dB PSR@1MHz,300μA静态电流,7.4ps FOM
低压差稳压器数字辅助双环路电源抑制比快速响应
▸创新点1:数字辅助双环路架构(系统创新)。该设计首次将数字LDO和模拟LDO的优势结合,通过数字环路快速响应大电流变化(300/100ns阶跃响应),模拟环路提供稳态低噪声输出(PSR -42dB@1MHz),双环路协同控制器实现无缝切换。
▸创新点2:动态功耗优化设计(电路创新)。数字环路仅在负载瞬变时激活(静态功耗接近0),模拟环路采用纳米级工艺(TSMC 40nm)实现300μA超低静态电流,整体FOM达7.4ps领先水平。
▸创新点3:混合信号稳定性控制(方法创新)。通过独创的环路控制器实现数字/模拟环路相位同步,在245mA满载时仍保持71mV超低过冲,解决了传统混合LDO的振荡问题。
▸创新点4:面积效率优化(电路创新)。在0.056mm²芯片面积内集成双环路系统,相比同类设计面积缩减30%,数字辅助电路采用时间交织技术提升采样精度。
Abstract
A digitally assisted high-current low-dropout (LDO)
regulator is proposed in this article. The LDO architecture
combines two main types of regulators: digital LDOs and analog
LDOs. The proposed architecture uses the digital loop for
tracking large output current variations and the analog loop
for steady-state operation. The dual loops have a loop controller
for coherent operation. Hence, the proposed LDO inherits some
advantages from both sides. It achieves high power supply
rejection (PSR) from