A novel method for oscillation canceling of CMOS opeational amplifires using Posicast

The operational amplifiers (Op-Amps) are the essential building blocks of many electronic circuits with wide applications. However, the operational amplifiers suffer from oscillation on their output (especially when are used in feedback loops) which leads to instability. This problem could be seen in step response of operational amplifiers as percent overshoot (P.O.). In this paper, a novel Posicast-based method is proposed to cancel the step response oscillation of operational amplifiers which experience pulse like inputs and therefore improve their settling time (Ts). The proposed method is applied on five different operational amplifiers (two-stage and three-stage) topologies and the results are simulated with HSPICE. The simulation results show a significant reduction in overshoot (96% average) and improvement in settling time (81% average) of the operational amplifiers.