For a solid foundation of microelectronics, Sedra and Smith's "Microelectronic Circuits" is the classic go to. Back when I worked at TI, they actually gave eve

For a solid foundation of microelectronics, Sedra and Smith's "Microelectronic Circuits" is the classic go to. Back when I worked at TI, they actually gave every new engineer a copy. This is a very entry level book that covers a huge number of topics well and will serve as a launching point to more specific topics. It starts with basic transistors and works up through Op-amp design and digital VLSI touching on filter theory and clocks along the way.