Design of a dynamic frequency compensation low dropout voltage regulator with buffer impedance attenuation

Abstract

This paper presents a low-drop (LDO) linear regulator with buffer impedance attenuation (BIA) for frequency compensation. This novel proposed LDO take advantage of the dynamically-biased shunt feedback in the buffer stage, which could lower its output resistance for driving the pass device to achieve fast response. Implemented in 0.35 m CMOS process, the LDO dissipates 184 A quiescent current and is able to deliver up to 100mA load current. With a 2.3 F output capacitance, the maximum transient-output variation is 25mV with full-load step change of 100mA.The proposed circuit will find application in the battery-powered portable devices. Kwyword: LDO; BIA; shunt feedback; pass deviceI.

A Low Drop-Out Voltage Regulator in 0.18 µm CMOS Technology

“…Such a regulator reduces the variations of voltage to a stable and acceptable level especially for product that are operated by portable battery such as cameras, hand phones, laptops. The study and research on power management techniques for different applications has been increasing rapidly for the last few years (Mohd-Yasin, Tan, & Reaz, 2004;Rosli, Mamun, Bhuiyan, & Husain, 2012;Chenchang & Hung, 2012;Peng, Changzhi, & Shuojie, 2012;Reaz et al, 2003;Nang, Ho, Jianping, & Or, 2011;Wu et al, 2011;Cheng, Yueh, & Liu, 2009;Akter, Reaz, Mohd-Yasin, & Choong, 2008) as a result of increased use of portable, handheld battery operated devices. Power management seeks to improve the power efficiency of devices resulting in prolonged battery life cycle and operating time for the device (Reaz, Choong, Sulaiman, & Mohd-Yasin, 2007;Akter, Reaz, Mohd-Yasin, & Choong, 2008;Romli, Mamun, Bhuiyan, & Hussain, 2012;Milliken, Martínez, & Sinencio, 2007;Kader, Rashid, Mamun, & Bhuiyan, 2012;Garimella & Furth, 2009;Marufuzzaman, Reaz, Rahman, & Ali, 2010;Arifin, Mamun, Bhuiyan, & Husain, 2012;Amin, Reaz, & Jalil, 2013;Reaz, Mohd-Yasin, Tan, Tan, & Ibrahimy, 2005).…”