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Voltage multipliers and charge pump devices

Voltage multipliers and charge pump devices. Romano Torres 6th March 2013. Step-up. Basically, uses a flying converter always connected to the input voltage:. Figure from reference [4]. Step-down. The flying capacitor is always connected to the output:. Figure from reference [4].

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Voltage multipliers and charge pump devices

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  1. Voltage multipliers and charge pump devices Romano Torres 6th March 2013

  2. Step-up • Basically, uses a flying converter always connected to the input voltage: Figure from reference [4]

  3. Step-down • The flying capacitor is always connected to the output: Figure from reference [4]

  4. TFT resistance Reference [5]

  5. Dickson’s charge-pump Ideal gain: Efficiency: Figure from reference [1]

  6. Voltage doubler design • Low parasitic capacitance • Low threshold voltage • Low output resistance Figure from reference [1]

  7. Analytically Efficiency: Reference [1]

  8. Analytically Gain: Output resistance: Reference [2]

  9. Different topologies Figures from reference [3]

  10. Bootstrapping • Possibility to use TFTs with smaller channel; • Could create lower parasitic capacitances and increase the voltage gain; Figures from reference [6]

  11. References • [1] D. Baberna, A. Cabrini, G. Torelli and M. Pasotti, “Efficiency Comparison between Doubler and Dickson Charge Pumps,” in Circuits and Systems IEEE International Symposium vol. 2, 2005, pp. 1891-1894. • [2] A. Cabrini, L. Gobbi and G. Torelli, “Theoretical and Experimental Analysis of Dickson Charge Pump Output Resistance,” in Circuits and Systems IEEE International Symposium, 2006, pp. 2749-2752. • [3] J. Starzyk. “A DC-DC Charge Pump Design based on Voltage Doublers,” in IEEE Transactions on Circuits and Systems-I: Fundamental Theory and Applications, 48:350–358, 2001. • [4] M. Wens and M. Steyaert. Design and Implementation of Fully-Integrated Inductive DC-DC Converters in Standard CMOS. Springer, 2011. ISBN 978-94-007-1435 • [5] A. Saiz-Vela, P. Miribel-Català, J. Colomer, M. Puig-Vidal and J. Samitier. ”Accurate Design of Two-Phase Voltage Doublers based on a Compact Mathematical Model,” in Circuits and Systems 5th Midwest Symposium, 2007, pp. 213-216. • [6] Y. Allasasmeh and S. Gregori, “Switch Bootstrapping Technique for Voltage Doublers and Double Charge Pumps,” in Circuits and Systems IEEE International Symposium, 2011, pp. 494-497.

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