A Fast Settling, High Slew Rate CMOS Recycling Folded Cascode Operational Transconductance Amplifier (OTA) for High Speed Applications

Abstract

Improved recycling folded cascode(RFC) operational transconductance amplifier(OTA) is presented in this brief. Performance of the proposed OTA is significantly enhanced in comparison to conventional folded cascode(FC) and recycling cascode(RFC) OTA by employing a dynamic current boosted adaptive bias circuit and positive feedback with an improved current mirror. The proposed design is simulated in a cadence virtuoso analog design environment with SCL $0.18\ \mu m$ standard CMOS technology. Simulation results indicate that the proposed OTA achieves a slew rate (SR), gain bandwidth (GBW), and settling time of $110 V/\mu s$, 224MHz and 14ns respectively at $400\ \mu A$ biasing current that is better than some state-of-the-art recently published designs.