Pareto ANOVA analysis for CMOS 0.18 µm two-stage Op-amp

This paper presents a Pareto ANOVA analysis technique as an alternative way to analyze some selected optimization parameters in two-stage op-amp. Three input parameters and two output parameters based on standard L27(313) in Taguchi method have been chosen in this optimization methodology. The input parameters are selected based on the value of W/L ratio at three transistors which are transistor M8, M9 and M7. Two types of outputs have been aimed to optimize which are power dissipation and gain. This op-amp has been constructed by using CMOS technology 0.18 µm and the results have been verified by using a Mentor Graphic EldoSpice. From the analysis, it is found that level 16 has been chosen as an optimal combination produced by a Taguchi method. After this, Pareto ANOVA technique will be applied to analyze the effect of selected input parameters in achieving optimum gain and power of the two stage op-amp. The analysis showed that the value of W/L ratio at transistor M9 gives a major impact on power dissipation and value of W/L ratio at transistors M8 and M9 give a major impact on gain. This study also shows that Pareto ANOVA is an easier method to analyze circuit parameters.