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Active and Passive Electronic Components
Volume 2017, Article ID 1650161, 6 pages
Research Article

A Self-Biased Active Voltage Doubler for Energy Harvesting Systems

Electrical Engineering Department, KFUPM, Dhahran 31261, Saudi Arabia

Correspondence should be addressed to Hussain A. Alzaher; as.ude.mpufk@hrehazla

Received 21 July 2017; Revised 30 September 2017; Accepted 9 November 2017; Published 3 December 2017

Academic Editor: Yuh-Shyan Hwang

Copyright © 2017 Umais Tayyab and Hussain A. Alzaher. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


An active voltage doubler utilizing a single supply op-amp for energy harvesting system is presented. The proposed doubler is used for rectification process to achieve both acceptably high power conversion efficiency (PCE) and large rectified DC voltage. The incorporated op-amp is self-biased, meaning no external supply is needed but rather it uses part of the harvested energy for its biasing. The proposed active doubler achieves maximum power conversion efficiency (PCE) of 61.7% for a 200 Hz sinusoidal input of 0.8 V for a 20 K load resistor. This efficiency is 2 times more when compared with the passive voltage doubler. The rectified DC voltage is almost 2 times more than conventional passive doubler. The relation between PCE and the load resistor is also presented. The proposed active voltage doubler is designed and simulated in LF 0.15 μm CMOS process technology using Cadence virtuoso tool.