This textbook introduces the principles and functioning of components and circuits, familiarizing the reader with the manufacturing processes of integrated circuits. After a clear introduction to semiconductor physics, the author discusses the most important components and basic circuits, deriving the corresponding equations in a way that allows the reader to apply the methodology to other, more complex circuits. In addition to the analog basic circuits—from single-stage amplifiers to integrated operational amplifiers—the book provides an overview of the design of digital circuits in CMOS technology. An introduction to the technology for manufacturing integrated CMOS circuits rounds out the content of the book. The interactive learning program S.m.i.L.E enables the understanding of complex relationships through interactive applets.