[IEEE 2012 International Conference on Synthesis, Modeling, Analysis and Simulation Methods and Applications to Circuit Design (SMACD) - Seville, Spain (2012.09.19-2012.09.21)] 2012 International Conference on Synthesis, Modeling, Analysis and Simulation Methods and Applications to Circuit Design (SMACD) - Determining the dominant nonlinear contributions in a multistage op-amp in a feedback configuration