A 120V/us high slew rate Operational Transconductance Amplifier with improved dynamic-output control technique (DOCT)

An Operational Transconductance Amplifier (OTA) with a novel dynamic-output control technique is proposed to achieve high slew rate (SR) performance in this work. The dynamic-output control technique utilizes two subtracters controlling the current sources to sink or source the output load adaptively. Moreover, as additional current sources are disabled in the DC operation status, the proposed structure has no adverse effect on the static power dissipation. The results based on CSMC 0.18μm BCD process show that DC gain is 50dB, phase margin is 70deg and the proposed OTA achieves a slew rate up to 120V/us with only 384μA static current dissipation.