J. Soldera,  A. Vilas Boas,  A. Olmos. 

This paper presents a low-ripple voltage-controlled charge pump regulator intended to feed internal blocks in a chip to guarantee regular operation when the power supply voltage drops below some predefined value. The circuit was implemented using an array of voltage doublers with a regulation system improved by a voltage controlled oscillator in the feedback path and a voltage ripple minimization technique. The circuit size is 0.556 mm/sup 2/ when fabricated in a 0.25 /spl mu/m CMOS technology and can supply loads consuming up to 8 mA from a 1.6 V to 2.3 V power supply.

http://ieeexplore.ieee.org/iel5/8726/27627/01232825.pdf?tp=&arnumber=1232825&isnumber=27627

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