Abstract
A conventional LDO(Low Dropout Regulator) uses one OPAMP and one signal path. This means that OPAMP`s DC Gain and Bandwidth can`t optimize simultaneously within usable power. This also appears that regulation property and settling time of LDO can`t improve at the same time. Based on this idea, a proposed LDO uses two OPAMP and has two signal path. To improve regulation property, OPAMP where is used in the path which qualities DC gain on a large scale, bandwidth designed narrowly. To improve settling time, OPAMP where is used in the path which qualities DC gain small, bandwidth designed widely. A designed LDO used 0.5um 1P2M process and provided 200mA of output current. A line regulation and load regulation is 12.6mV/V, 0.25mV/mA, respectively. And measured settling time is 1.5us in 5V supply voltage.
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