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Title A High Power Supply Rejection and Fast-transient LDO with Feed-forward Compensation using Current Sensing Technique
Authors (Bongsu Kim) ; (Seung-Myeong Yu) ; (Jongchan An) ; (Gwangmyeong An) ; (Junyoung Song)
DOI https://doi.org/10.5573/JSTS.2024.24.1.41
Page pp.41-46
ISSN 1598-1657
Keywords LDO; power management IC; power supply rejection ratio (PSRR); feed-forward
Abstract This paper presents a high power supply rejection ratio (PSRR) and a method to achieve stability for low-dropout (LDO) regulators, an essential system-on-chip (SoC) component. The feedforward method improves the PSRR in the LDO regulator by adjusting the output voltage with a compensation signal which is proportional to the power supply noise. Also, the proposed current sensing is incorporated into the LDO regulator's design to ensure stability. The proposed LDO regulates the output at 1 V from a 1.2 V supply and has been implemented based on a 28 nm CMOS process. Compared with a conventional LDO, the simulated PSRR has a -38 dB enhancement at 100 kHz and shows low overshoot and undershoot.