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Impact of Tantalum Capacitor on Performance of Low Drop-out Voltage Regulator

Megha Goyal, Dimple Saproo

The motivation behind the paper of Low Drop-Out (LDO) regulators is driven by the growing demand for higher performance power supply circuits.Power management has had an ever increasing role in the present electronic industry. Battery powered and handheld applications require power management techniques to extend the life of the battery and consequently the operation life of the device. Most systems incorporate several voltage regulators which supply various subsystems and provide isolation among such subsystems. Low dropout (LDO) voltage regulators are generally used to supply low voltage, low noise analog circuitry. Each LDO regulator demands a large external capacitor to improve supply noise rejection and transient response, in the range of a few microfarads, to perform. A CMOS LDO voltage regulator which is stable with high ESR tantalum output capacitor is studied in this paper.