有源元件和无源元件（Active and passive components）.docVIP

有源元件和无源元件（Active and passive components） Simply speaking, the device that needs to be able to (source) is called an active device, and a device without a source is a passive device. Active devices are generally used for signal amplification, conversion, etc., passive devices for signal transmission, or by directional signal amplification.. Capacitance, resistance and sense are passive devices, and IC, module and so on are active devices. Passive devices (passive, devices, passive components), also known as linear components, in the circuit of electrical characteristics for a straight line. Active devices (active, devices, active components) are also called linear elements, and the electrical characteristics in the circuit are not in a straight line. In the analysis of electronic circuit function and technical parameters, the general electronic components are divided into passive devices and active devices in two categories. 1. simple definition of passive device If an electronic component operates without any form of power within it, the device is called a passive device. From the nature of the circuit, there are two basic characteristics of passive devices: (1) self or consumption of electrical energy or the transformation of electrical energy into other forms of energy. (2) just enter the signal, without additional power supply can work properly. 2. basic definitions of active devices This device is called an active device if an electronic component has a power source inside it. From the nature of the circuit, there are two basic characteristics of active devices: (1) consume electricity by itself. (2) in addition to the input signal, you must also have an additional power supply to work properly. It can be seen that active devices and passive devices are very different to the working conditions and working methods of the circuit, which must be paid attention to in the process of learning electronic technology. I. common passive electronic devices Passive devices