A dynamic‐biasing 4× charge pump based on exponential topology |
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Authors: | Oi‐Ying Wong Hei Wong Wing‐Shan Tam Chi‐Wah Kok |
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Affiliation: | 1. Department of Electronic Engineering, City University of Hong Kong, Kowloon, Hong Kong;2. Canaan Semiconductor Ltd., Science Park, New Territories, Hong Kong |
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Abstract: | A 4× charge pump using exponential topology is proposed and implemented. Comparing to the conventional implementations, the proposed circuit suppresses the reverse current effectively without using different threshold‐voltage transistors and additional capacitors. Also, the body effect found in the charge transfer switches is eliminated. The proposed charge pump is analyzed with the state‐space method and fabricated using 0.35 µm complementary metal–oxide–semiconductor process. Results show that the output voltages close to the ideal one, and a maximum power efficiency of 95% was recorded. Copyright © 2013 John Wiley & Sons, Ltd. |
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Keywords: | charge pump switched‐capacitor DC/DC converter voltage multiplier |
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