Publisher Summary The chapter discusses electronic devices and circuits which have applications in electronic automotive instrumentation and control systems. The chapter focuses on semiconductor devices, analog circuits, digital circuits, and the fundamentals of integrated circuits. Semiconductor devices are made from silicon or germanium purposely contaminated with impurities that change the conductivity of the material. Transistors are semiconductor devices that are used as active devices in electronic circuits. In some automotive applications, the extreme temperatures may significantly affect transistor operation. For such applications, the circuit may include components that automatically compensate for changes in transistor operation.