Reduction of Peak Input Currents during Charge Pump Boosting in Monolithically Integrated High-Voltage Generators

This paper describes two methods for the reduction of
the peak input current during the boosting of Dickson charge pumps.
Both methods are implemented in the fully integrated Dickson charge
pumps of a high-voltage display driver chip for smart-card
applications. Experimental results reveal good correspondence with
Spice simulations and show a reduction of the peak input current by a
factor of 6 during boosting.

Authors:

• Jan Doutreloigne

Keywords:

• Bi-stable display driver
• Dickson charge pump
• highvoltage generator
• peak current reduction
• sub-pump boosting
• variable frequency boosting.

References:

[1] J. F. Dickson, “On-chip high-voltage generation in MNOS integrated
circuits using an improved voltage multiplier technique,” IEEE Journal
of Solid-State Circuits, vol. 11, no. 3, 1976, pp. 374-378.
[2] G. Di Cataldo, and G. Palumbo, “Design of an n-th order Dickson
voltage multiplier,” IEEE Transactions on Circuits and Systems-I:
Fundamental Theory and Applications, vol. 43, no. 5, 1996, pp. 414-
417.
[3] G. Palumbo, D. Pappalardo, and M. Giabotti, “Charge-pump circuits:
power-consumption optimization,” IEEE Transactions on Circuits and
Systems I: Fundamental Theory and Applications, vol. 49, no. 11, 2002,
pp. 1535-1542.
[4] G. Palumbo, D. Pappalardo, and M. Giabotti, “Modeling and
minimization of power consumption in charge pump circuits,” Proc. of
the 2001 IEEE International Symposium on Circuits and Systems
(ISCAS), 2001, pp. 402-405.
[5] C. Lauterbach, W. Weber, and D. Romer, “Charge sharing concept and
new clocking scheme for power efficiency and electromagnetic emission
improvement of boosted charge pumps,” IEEE Journal of Solid-State
Circuits, vol. 35, no. 5, 2000, pp. 719-723.