An Adaptively-Biased Output-Capacitor-Free Low-Dropout Regulator with Supply-Ripple-Subtraction and Pole-Tracking-Compensation

This paper presents an adaptively-biased output-capacitor-free LDO regulator with pole-tracking-compensation for wearable biomedical electronics. The proposed LDO consists of a supply-ripple subtraction reference buffer which enhances PSR from -26.4dB to -67.4dB at 1MHz. The total quiescent current is 8.6A at no load, and the current efficiency is 98.8% at full load. Designed and fabricated in a 0.18m CMOS process, the prototype silicon area is 0.0113mm2.