Advances in Active-Feedback Frequency Compensation With Power Optimization and Transient Improvement

H. Lee, P.K.T. Mok
2004 IEEE Transactions on Circuits and Systems I Fundamental Theory and Applications  
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 feed-forward stage (DFS), which can be embedded into the AFFC amplifier
more » ... the AFFC amplifier to improve the transient responses without consuming extra power, is proposed. Implemented in a 0.6-µm CMOS process, experimental results show that both AFFC amplifiers with and without DFS achieve almost the same small-signal performances while the amplifier with DFS improves both the negative slew rate and negative 1% settling time by 2 times. Index Terms Active feedback, amplifiers, dynamic feed-forward stage, frequency compensation, low-power stability strategy, multistage amplifiers.
doi:10.1109/tcsi.2004.834514 fatcat:mcgwhyck6fbhdptce66b76nrja