Abstract
Charge balance law based on conservation of charge is stated and employed to analyze on-chip linear, Fibonacci and exponential charge pumps. For micro-power on-chip implementations, both the positive- and the negative-plate parasitic capacitors have to be considered. Voltage conversion ratios and efficiencies can be obtained in closed form for single- and dual-branch linear charge pumps, but not for Fibonacci and exponential charge pumps. Instead, a first iteration approximation analysis for computing voltage conversion ratio is proposed. For the linear charge pump, efficiency optimization is achieved by first computing the optimal number of stages, and then obtaining from the required output voltage the reduction factor that is a function of load current, flying capacitor and switching frequency. Using a 0.35(m CMOS process, 8X linear, Fibonacci and exponential charge pumps are designed and their performances are compared and confirmed by extensive Cadence Spectre simulations. It is concluded that linear charge pumps attain the best efficiency.
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Brugler, J.S.: Theoretical performance of voltage multiplier circuits. IEEE J. Solid-State Circ. 6(3), 132–135 (1971)
Dickson, J.: On-chip high-voltage generation in MNOS (NMOS) integrated circuits using an improved voltage multiplier technique. IEEE J. Solid-State Circ. 11(3), 374–378 (1976)
Witters, J.S., Groeseneken, G., Maes, H.E.: Analysis and modeling of on-chip high-voltage generator circuits for use in EEPROM circuits. IEEE J. Solid-State Circ. 24(5), 1372–1380 (1989)
Tanzawa, T., Atsumi, S.: Optimization of word-line booster circuits for low-voltage flash memories. IEEE J. Solid-State Circ. 34(8), 1091–1098 (1999)
Palumbo, G., Pappalardo, D., Gaibotti, M.: Charge-pump circuits: power-consumption optimization. IEEE Tran. Circ. Syst. I 49(11), 1535–1542 (2002)
Hoque, M., Ahmed, T., McNutt, T., Mantooth, H., Mojarradi, M.: A technique to increase the efficiency of high-voltage charge pumps. IEEE Tran. Circ. Syst. II 53(5), 364–368 (2006)
Palumbo, G., Pappalardo, D.: Charge pump circuits: An overview on design strategies and topologies. IEEE Circ. Syst. Mag. 10(1), 31–45 (2010)
Tanzawa, T.: A switch-resistance-aware Dickson charge pump model for optimizing clock frequency. IEEE Tran. Circ. Syst. II 58(6), 336–340 (2011)
Ueno, F., Inoue, T., Oota, I., Harada, I.: Emergency power supply for small computer systems. In: IEEE Int’l Symp. Circ. Syst., pp. 1065–1068. IEEE Press, New York (1991)
Cernea, R.A.: Charge pump circuit with exponetral (exponential) multiplication. US Patent 5,436,587 (July 25, 1995)
Ki, W.H., Su, F., Lam, Y.H., Tsui, C.Y.: N-stage exponential charge pumps, charging stages therefore and methods of operation therefore. US Patent 7,397,299 (July 8, 2008)
Ki, W.H.: Gain- and Offset-Compensated Switched-Capacitor Circuits. Ph. D. Thesis, UCLA (June 1995)
Ki, W.H., Su, F., Tsui, C.Y.: Charge redistribution loss consideration in optimal charge pump design. In: IEEE Int’l Symp. Circ. Syst., pp. 1895–1898. IEEE Press, New York (2005)
Ki, W.H., Lu, Y., Su, F., Tsui, C.Y.: Design and analysis of on-chip charge pumps for micro-power energy harvesting applications. In: IEEE VLSI-SoC, pp. 374–379. IEEE Press, New York (2011)
Wu, W.C., Bass, R.M.: Analysis of charge pumps using charge balance. In: IEEE Power Elec. Specialists Conf., pp. 1491–1496. IEEE Press, New York (2000)
Han, J., von Jouanne, A., Temes, G.C.: A new approach to reducing output ripple in switched-capacitor-based step-down DC–DC converters. IEEE Tran. Power Elec. 21(6), 1548–1555 (2006)
Starzyk, J.A., Jan, Y.W., Qiu, F.: A DC-DC charge pump design based on voltage doublers. IEEE Trans. Circ. Syst. I 48(3), 350–359 (2001)
Su, F., Ki, W.H.: Component-efficient multi-phase switched capacitor DC-DC converter with configurable conversion ratios for LCD driver applications. IEEE Trans. Circ. Syst. II 55(8), 753–757 (2008)
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Ki, WH., Lu, Y., Su, F., Tsui, CY. (2012). Analysis and Design Strategy of On-Chip Charge Pumps for Micro-power Energy Harvesting Applications. In: Mir, S., Tsui, CY., Reis, R., Choy, O.C.S. (eds) VLSI-SoC: Advanced Research for Systems on Chip. VLSI-SoC 2011. IFIP Advances in Information and Communication Technology, vol 379. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-32770-4_10
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DOI: https://doi.org/10.1007/978-3-642-32770-4_10
Publisher Name: Springer, Berlin, Heidelberg
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