Study and analysis of charge pump circuits and inductor based Dc-Dc converters for mobile applications

The mobiles market is very active; constructors do not stop to add functionalities to their mobiles. Power supplies relies on batteries. However batteries provide a limited operating time and ustable voltage; given the highly variable nature of batteries (e.g., 2.7–4.2 V for Li-ion), systems often require supply voltages to be both higher and lower than the battery voltage (e.g., power amplifier for CDMA applications). In order to ensure a correct behavior of embedded sub-circuits of mobiles which need a stable and clean voltage, DC-DC converters are employed to generate different stable and fixed voltage from battery.