The book is designed primarily for courses in operational amplifiers and linear integrated circuits for Electrical, Electronics, Instrumentation, Computer Engineering and Applied Science students. The text has been written in a style to enable students to self study. Examples are provided throughout the book to help the students assimilate the material covered. The text is so designed that the faculty may hardly need to consult reference books. It provides fabrication technology for ICs, wide array of op-amp 741 applications, 555 timer, 565 PLL, linear voltage regulator ICs, 78/79XX, 723, AD/DA converters, active filters using 741, switched capacitor filters and OTAs in a comprehensive manner. In the last multicolor edition, all the chapters were reorganized more logically and new material was added in many chapters. Further, a separate chapter on OTA and its applications was the major highlight of the fifth edition. In the sixth edition, multiple choice questions (MCQs) have been added in each chapter to make this book more helpful. MCQs are objective type of questions that help in measuring the capability of a student on various topics.