Analysis of Drop Out and Load Current for on Chip Voltage Regulators

Abstract

LDO (Low Drop-Out) Voltage regulators are commonly used in electronics power supply circuit. DC linear voltage regulator is a LDO regulator that can regulate the output voltage even when the power supply voltage is very near to the output voltage. This paper present a comparison between two of the most admired voltage regulator structures such as feed forward ripple cancellation technique and MOS capacitor compensation technique.The comparison has been carried out considering the output voltage, power consumption, drop-out voltage, load current, quiescent current, line regulation and load regulation. The discussion is supported by practical analysis of both the voltage regulator. The two LDO voltage regulators are taken with power supply voltage, reference voltage, error amplifier, pass transistor. The object of this paper is to compare the all the parameter of the voltage regulator to found best LDO voltage regulator structure. The comparison showed that the voltage regulator circuit with MOS capacitor compensation technique (MCC) is best rather than feed forward ripple cancellation technique (FFRC).All simula-tion and result of LDO voltage regulator is done at tanner tool 14.1.