If you need a free alternative, consider or MIT OpenCourseWare’s 6.002 lecture notes—both are legal and cover similar fundamentals with less depth.
Target Audience: Undergraduate electrical engineering students (2nd or 3rd year), self-learners with basic circuit theory knowledge. razavi microelectronics pdf
Students who prefer math-first derivations, or anyone needing heavy CMOS-only coverage (choose Razavi’s Design of Analog CMOS ICs instead). If you need a free alternative, consider or
Visual learners, self-starters, and future analog/RF IC designers. If you need a free alternative