Advances in active-feedback frequency compensation with power optimization and transient improvement

This paper presents a low-power stability strategy to significantly reduce the power consumption of a three-stage amplifier using active-feedback frequency compensation (AFFC). The bandwidth of the amplifier can also be enhanced. Simulation results verify that the power dissipation of the AFFC amplifier is reduced by 43 % and the bandwidth is improved by 32.5 % by using the proposed stability strategy. In addition, a dynamic feedforward stage (DFS), which can be embedded, into the AFFC amplifier to improve the transient responses without consuming extra powerJs proposed. Implemented in a.0.6-mum CMOS process, experimental results show that both AFFC, amplifiers with, and without DFS achieve almost the same 5mall-signal performances while the amplifier with DFS improves both the negative slew rate and negative 1% settling time by two times.