Charge pump for LCD driver used in cell phone

A charge pump design is presented to operate at 10 kHz with 100 μA in a liquid crystal display (LCD) driver for cell phone. Optimal channel widths are designed by estimating the power consumption of the Fibonacci-like charge pump. An optimal frequency is a compromise between the rise time and the dynamic power dissipation. The optimization of the two-phase nonoverlapping clock generator circuit improves the efficiency. Simulation results based on 1.2 μm complementary metal-oxide-semiconductor (CMOS) technology parameters verify the efficiency of the design.