Two Stage Operational Amplifiers: Power and Area Efficient Frequency Compensation for Driving a Wide Range of Capacitive Load

摘要

Operational amplifiers (OpAmps) have found extensive applications in analog circuits and systems for communications, consumer electronics, controls and signal conversion. Two-stage OpAmps with frequency compensation are popular for driving capacitive loads while ensuring sufficient gain and stability. Frequency compensation techniques have been evolving over the last decades in distinct applications. In particular, power-and-area-efficent two-stage OpAmps capable of driving a wide-range capacitive load are demanded for low-dropout regulators (LDOs) or LCD-panel drivers. Capacitor multiplers (CMs) have emerged as one of the best solutions to implement such kind of OpAmps.