关键词: 零极点跟踪, 低压差线性稳压器, 环路稳定性, 无片外电容

Abstract: In the paper,a LDO circuitwithoutexternalcapacitoris designed.According to the constantchange of load,the zero-pole tracking compensation circuit is designed to make the zero effectively compensate the circuitpole and to ensure the stability ofthe LDO loop.Based on TSMC 0.18 μm flash process,the circuitand layout design and tape-out is completed.The circuit simulation and test results show that in the absence of externalcapacitorcase,the loop phase margin can reach 78.9°,which achieves high stability requirements.The maximum load currentcan reach 100 mA,and the load regulation rate is0.2 mV/mA.

Key words: pole-zero tracking, low dropoutregulator, loop gain stability, no off-chip capacitor