High power-supply rejection low drop-out regulator

An off-chip load driving low drop-out regulator with high power-supply rejection is proposed in this paper. The 1.2-V regulator uses adaptive frequency compensation and is stable at all load currents. A power-supply rejection of 70 dB with load and line regulation figures of under 2 mV and 10 mV for 1-350 mA and 2.1-3.6 V load current and power supply variations were measured on a 65-nm CMOS prototype consuming under 0.05 mm² core area and 40 muA quiescent current.