Power management in a battery operated device can be done with the help of voltage regulators. This work proposes the design of a low drop out (LDO) regulator that provides the required supply voltage to different modules of the battery operated devices. The system is designed in 180nm technology with 1. 8 V supply. Low power implementation of the design can be achieved using the self-sustainability of the regulator. The proposed regulator system can be made as selfsustainable by providing the 1. 8 V regulated output as the supply for some blocks of the system. So the battery voltage is no longer required for the functioning of those blocks. The current gain of the operational amplifier has been improved by adding a buffer stage after the common source amplifier. This buffer will improve the ability of the LDO regulator to drive large capacitive and resistive loads.

1. Chung-Hsun Huang, Ying-Ting Ma, and Wei-Chen Liao, "Design of a Low-Voltage Low Drop-out Regulator", IEEE transactions on Very Large Scale Integration (VLSI) systems, Vol. 22,No. 6, June 2014.
2. Naga Prasad Reddy, Martin T, Chandra Mohan, "Design and VLSI Implementation of Low Voltage and Low Dropout Voltage Regulator", International Journal of Computer Trends and Technology (IJCTT), Volume 4 Issue 8 August 2013.
3. C. Chen, J. H. Wu, and Z. X. Wang, "150mA LDO with self-adjusting frequency compensation scheme", Electron Lette. , Vol. 47, No. 13, pp. 767-768, June 2011.
4. A. Garimella, M. W. Rashid and P. M. Furth, "Reverse nested miller compensation using current buffers in a three stage LDO", Proc. IEEE trans. Circuits Syst. II Exp. Briefs, vol. 57, no. 4, pp-250-253, April 2010.
5. M. El-Nozahi, A. Amer, J. Torres, K. Entesari, and E. Sanchez-Sinencio, "High PSR low drop-out regulator with feed-forward ripple cancellation technique", IEEE Solid-State Circuits, vol. 45, no. 3, pp. 565577,March 2010.
6. VaibhavKumar, "High bandwidth low power operational amplifier", Graduate theses and dissertations, Paper 10766, 2009.
7. Robert . J. Milliken, "Full On-Chip CMOS Low-Dropout Voltage Regulator", IEEE transactions on circuits and systems-I: Regulator papers, Vol. 54, No. 9, September 2005.
8. Kent H. Lundberg, "Internal and external opamp compensation: A control centric tutorial", American control conference, 2004.
9. Allen, Holberg, CMOS Analog Circuit Design, Oxford University Press, Second Edition, 2002.
10. BehzadRazavi, Design of Analog CMOS Integrated Circuits, Mcgraw-Hill International edition, 2001.
11. BehzadRazavi, "CMOS Technology Characterization for Analog and RF Design", Solid state circuits, IEEE journal, vol. 34, iss. 3, pp 268-276, March 1999.
12. UBM Canon Electronics Engineering Communities http://www. eetimes. com/document. asp
13. Integrated Design and Verification Technologies, Methodologies, and Appication-Specific Kits http://www. cadence. com/products/cic/analog-design- environment/pages/default. aspx
14. Calculating "useable amps" http://electronics. stackexchange. com/questions/64056/calculating-useable-amps

Low Drop Out Power Management Voltage Regulator Self-sustainability.