A 12 <i>μ</i>A -82 dB PSR LDO with PSR enhance technique and dynamic compensation technique

This article presents a novel low dropout regulator with high PSR and reliable stability. In order to achieve high PSR, this design use PSR enhance circuit to filter the voltage ripple from reference at low frequency, and achieving -82 dB PSR at 1 KHz with the load of 20 mA. Besides, owing to the dynamic RC compensation network, this design can reconfigure the compensation resistor and capacitor, and achieve good stability at full load up to 250 mA. Finally, this design was implemented with the 0.5-μm CMOS technology, and the total quiescent current of the proposed LDO is only 12 μA.