A New Class-AB Flipped Voltage Follower Using a Common-gate Auxiliary Amplifier

F. Centurelli, P. Monsurrò, D. Ruscio, A. Trifiletti (Univ. Rome Sapienza, Italy)

A novel class-AB Flipped Voltage Follower is proposed, suitable for low-voltage low-power CMOS implementation in advanced technology nodes. Simulations have been performed using STMicroelectronics models for the 45nm technology. The Flipped Voltage Follower allows low output impedance and high linearity by means of a feedback loop. However, like the conventional common-drain voltage follower, it has class-A behavior. Class-AB behavior enables faster settling with large capacitive loads and/or lower power consumption.