A low noise, high PSR low-dropout regulator for low-cost portable electronics

This paper presents A low noise, high PSRR low-dropout regulator for low-cost portable electronics. The proposed LDO uses an Operational Transconductance Amplifier (OTA) with Miller R-C compensation to ensure a stable phase margin greater than 62°. The active chip of the proposed regulator is only 150×680 um2. The design was simulated and lyouted in Cadence using mixed-signal 90 nm 2P9M CMOS process, the simulation results show that this LDO output voltage can achieves line regulation of less than 0.10% and load regulation of better than 0.25% and a low quiescent current of only 90uA and ultra-low noise of only 65 nV/SqrtHz. Moreover, it can achieve a PSRR of -52 dB and -64 dB at 1 and 10 kHz, respectively. The input voltage is ranged from 2.70 to 5 V for a load current 100 mA and an output voltage of 1.5 V.