A 0.93-μW Single-Stage Rail-to-Rail Class AB Buffer Amplifier Improving DC gain and Slew-Rate with Different-Ratio Current-Mirrors and Positive-Feedback Loops

초록

This paper presents a rail-to-rail class AB single-stage buffer amplifier to drive a capacitive load (Co). To achieve a high DC gain and a high slew-rate (SR), the proposed amplifier uses different-ratio current-mirrors (DRCMs) and positive feedback loops (PFLs). The proposed amplifier drives a wide range of Co over 0.15-15 nF owing to the single-stage structure. A prototype chip was fabricated in a 0.18-μm CMOS process and occupies an area of 0.014 mm2. © 2021 JSAP.