This course introduces semiconductors. PN-junctions and their application as rectifiers, clippers, and voltage regulators are discussed. It also discusses the operation of bipolar junction transistors (BJT) and field effect transistors (FET). The course covers small signal modeling of BJTs and FETs and their use as single stage amplifiers. BJT and metal–oxide–semiconductor field-effect transistor (MOSFET) differential and multistage amplifiers, amplifier classification, and power amplifiers are also discussed.