The material written in this book is organised in a way that provides considerable flexibility in its use at Postgraduate and Research level. The entire text covers a number of basic and advance Operational Amplifiers. Operational Amplifiers are linear devices which have characteristics necessary not only for amplification on the other hand utilised broadly for signal manipulation, filtering and for numerical operations for instance comparison, differentiation, filtering, addition, subtraction, integration and so forth. Designing an Op-Amp as per the prerequisite application has turned out to be worth mentioning. As far as analog and mixed signal circuit design is considered, the most essential and widely used building block is operational amplifier. The growing demand of compact hardware gadgets influences the designer's imagination concerning the design of low power and low voltage IC's. Salient features of the book - Detailed explanation of various Op-Amps - Study of various Op-Amp parameters - Small signal Gain Analysis - Folded cascode Op-Amp and its detailed Analysis - Rail-to Rail architecture is presented - Power Analysis Results - Comparison Analysis of various Op-Amps