Full On-chip low dropout voltage regulator with an enhanced transient response for low power systems

Abstract

<span>A full on chip low Dropout Voltage Regulator (LDO) with fast transient response and small capacitor compensation circuit is proposed. The novel technique is implemented to detect the variation voltage at the output of LDO and enable the proposed fast detector amplifier (FDA) to improve load transient response of 50mA load step. The large external capacitor used in Conventional LDO Regulators is removed allowing for greater power system integration for system-on-chip (SoC) applications. The 1.6-V Full On-Chip LDO voltage regulator with a power supply of 1.8 V was designed and simulated in the 0.18µm CMOS technology, consuming only 14 µA of ground current with a fast settling-time LNR(Line Regulation) and LOR(Load regulation) of 928ns and 883ns respectively while the rise and fall times in LNR and LOR is 500ns.</span>

A New CMOS OP-AMP Design with an Improved Adaptive Biasing Circuitry

“…An OP-AMP is essential to deliver the appropriate parameters to match the requirements of various analog converters. In Low dropout (LDO) regulators and switching converters, an OP-AMP used as an error amplifier to increase the control accuracy of the power transistor [4] [5]. In the Analog/Digital Converters (ADC), the op amp can be used as a buffer to provide the appropriate offset and gain to match the output signal to the input range [6].…”