Abstract
An energy-efficient charge pump (CP) for solar energy harvesting is presented. A multistep split–merge charge transfer operation is introduced to replace the traditional one-step charge transfer process. Theoretically, this method increases the amount of charge transferred by up to 26% while reducing the Joule heat power loss by up to 7%. A five-stage complementary split–merge CP was designed and fabricated in a 0.13- $\mu\text{m}$ CMOS process. Measured results show an averaged 15.2% improvement of power conversion efficiency and a 1/8-fold reduction of output voltage ripple.
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