Characteristics of analog signals and analog circuits

fighting

Characteristics of analog signals and analog circuits [Copy link]

Start learning analog electronic circuits from Chapter 3 of the textbook. 　　1. The concept of analog signals and analog circuits 　　Analog signals are electrical quantities that change continuously in time and size. 　　Analog electronic circuits (analog circuits for short) are the general term for circuits that realize the functions of amplifying, transforming, processing and generating analog signals. 　　2. Characteristics of analog circuits 　　The electrical signals of analog circuits are continuously changing electrical quantities, and their amplitudes are arbitrary within a certain range. Therefore, the circuit is required to amplify or process such signals without distortion, so the requirements for components, circuit parameters and external conditions are relatively strict . For example, semiconductor devices in amplifier circuits usually work in a linear amplification state. 　　Amplifier circuits are the most basic unit circuits in analog circuits. Amplifier circuits generally contain triodes or integrated amplifier devices with nonlinear characteristics. They require DC to provide a static operating point, and what is amplified is an AC signal. Therefore, when analog circuits are working, there are both DC and AC, both linear components and nonlinear devices are working, and both static analysis and dynamic analysis are required . During learning, you must be familiar with knowledge of AC and DC circuits, the transition process of RC circuits, and semiconductor devices. Therefore, in this course we have to learn some basic circuit compositions, working principles and analysis methods of analog circuits, as well as their applications, to lay the foundation for future related work.