A High-Precision Output-Tuning Technique for LDO Regulator
MU Yunfe · 2015
A high-precision output-tuning technique used for low-dropout regulator( LDO) is presented in this paper.A tunable resistor ladder is utilized in the feedback network for high-precision LDO output control. Dummy resistors are also introduced to surround the unit resistors for good matching performance. The applicability and superiority of this proposed method is verified by the design of a 65nm CMOS LDO. The design results show that the line regulation of this LDO is about 0. 05mV/V,and the output voltage can be precisely tuned by 0. 02V / step within a range from 1.02V to 1. 36V. The high-precision tuning ability can effectively overcome the output errors caused by power supply variation,temperature drift and other non-ideal factors,making it very suitable for embedded So C( So C:System on Chip) applications.