The book provides an overview of the extensive field of analog circuits and their applications. It imparts knowledge to the reader about the functioning, characteristics, sizing guidelines, and potential uses of analog circuits. A key objective of the book is to promote methodological and technical thinking. Special care has been taken to present the material in a methodical and as straightforward manner as possible, along with a practical and clear systematics and structure. A physically illustrative representation is preferred, allowing for a quick overview of the operation and behavior of the circuits, as well as insight into their principles of operation. The examples have been selected to reflect common working methods in practice and to familiarize the reader with typical numerical values.