Multistage operational transconductance amplifier frequency compensation technique based on fully differential feedback stage

Abstract In this article, a new configuration of a three‐stage Complementary metal‐oxide‐semiconductor (CMOS) operational transconductance amplifier (OTA) is proposed. It removes the feedforward path while simultaneously amplifying the feedback path in the compensation network. Also, the proposed circuit uses only one small compensation capacitor which makes it appropriate regarding die area. The approach behind is demonstrated through a successful design using 0.18‐μm CMOS technology. In fact, the simulated OTA shows better performance in comparison with other methods and achieved 20.2 MHz, 82°, and 124 dB as gain‐bandwidth product, phase margin, and DC gain, respectively, and consumes 545 μW @ 1.8 V.