Review of Charge Pump Topologies for Micro Energy Harvesting Systems
Michelle Lim Sern Mi, Md. Shabiul Islam, Jahariah Sampe and Sawal Hamid Md. Ali
DOI : 10.3844/ajassp.2016.628.645
American Journal of Applied Sciences
Volume 13, Issue 5
This paper reviews CMOS based charge pump topologies used within autonomous embedded micro-systems. These charge pump structures have evolved from its simplistic diode-tied, single-branches with major threshold drops to exponential type, dual-branches with sophisticated gate and substrate control for lower voltage operation. Published charge pumps are grouped based on architecture, operation principles and pump optimization techniques with their pros and cons compared and results contrasted. The various charge pump topologies and schemes used are considered based on pumping efficiency, power efficiency, charge transferability, circuit complexity, pumping capacitors, form factor and minimum supply voltages with an optimum load. This article concludes with an overview of suitable techniques and recommendations that will aid a designer in selecting the most suitable charge pump topology especially for low ambient micro energy harvesting applications.
© 2016 Michelle Lim Sern Mi, Md. Shabiul Islam, Jahariah Sampe and Sawal Hamid Md. Ali. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.