What is a full range of active devices?

What is an active device? What functions does it have? Power engineers are either designing chips or selecting electronic components every day. Electronic components can also be subdivided into active devices and passive devices. So can you systematically explain the characteristics and composition of active devices? Do you know how many categories they are divided into? Let’s increase our knowledge together!

Active devices are electronic components that require power to perform their specific functions. Mainly including electron tubes, transistors, integrated circuits, etc. Generally used for signal amplification, conversion, etc. If an electronic component has power inside it when it is working, the device is called an active device. This is an electronic device that requires a source of energy to perform its specific functions. In terms of physical structure, circuit function and engineering parameters, active devices can be divided into two categories: discrete devices and integrated circuits.

Define the angle:

To put it simply, devices that require energy (electricity) are called active devices. Active devices are generally used for signal amplification, conversion, etc.

Active devices (active devices) are electronic devices that require energy to perform their specific functions.

Basic definition of active devices:

If an electronic component has power inside it when it is working, the device is called an active device.

Features:

(1) It also consumes electricity itself.

(2) In addition to the input signal, an external power supply is also required to operate normally.

Classification:

electron tube

Electron tubes are also called vacuum tubes, so they are also called electric vacuum devices.

Regardless of whether the electron tube is diode or multipole, it has an anode and a cathode. Under the action of an external power supply, the cathode emits electrons and flows toward the anode. The external power supply can be applied directly to the cathode or to another heating filament. It is because of the existence of this external power supply that they are collectively called active devices. Vacuum tubes are the earliest active electronic components and are divided into diodes, transistors and multiodes. With the development of electronic technology, electron tubes have given way to transistors and integrated circuits due to their shortcomings such as large size, heavy weight, and high power consumption. However, there are many occasions where vacuum tubes continue to play a role. For example: the final power amplification of high-power transmitters; display tubes of various monitors; picture tubes of televisions, etc.

transistor

Belongs to semiconductor devices. Substances with electrical conductivity between conductors and insulators are called semiconductors. Crystals such as silicon and germanium are semiconductors. Therefore, electronic devices made of these crystal materials are called transistors. It is divided into crystal diodes and crystal transistors.

integrated circuit

As the name suggests, the circuit is a concentrated manufacturing of active devices, passive devices and connecting wires on a very small silicon chip, and then wired and packaged to form a miniature whole with predetermined functions. (symbol is IC). The advantages of integrated circuits are small size, long life, low cost, reliability and high performance. Currently, integrated circuits and large-scale integrated circuits are increasingly widely used.

composition:

(1) Integrated operational amplifier (operation amplifier), referred to as integrated operational amplifier

(2) Comparator

(3) Logarithmic and exponential amplifiers

(4) Analog multiplier/divider (multiplier/divider)

(5) Analog switch circuit (analog switch)

(6) PLL circuit (phase lock loop), that is, phase locked loop circuit

(7) Integrated voltage regulator (voltage regulator)

(8) Reference source

(9) Wave-form generator

(10) Power amplifier

Summary: The above is the relevant knowledge about active devices, I hope it can help you.