This groundbreaking textbook provides coverage for the second semester, core course in electronic circuits. Unlike most textbooks for this course, this one covers the mathematics of frequency-domain analysis, the traditional language of electrical engineering, in the context of real engineering applications and design. The author has structured the material to enable readers to develop into functioning engineers who can apply this theory to the understanding and design of a complex circuit that performs useful and desirable signal processing functions, through introduction of topics in Design-Oriented Analysis. Readers also will benefit from material that will help them build a foundation for their future studies in topics such as signal processing, control systems, RF circuits, power electronics, and communications.