How much do you know about field effect transistors?

In our daily work and life, we use electronic machinery very frequently, but how much do we know about the field effect tube, which is very common in machinery? Let me introduce it to you.

In today's life, field effect tubes are used in home appliances, whether it is air conditioners, computers, or LCD TVs. So what is a field effect tube? Many people have a vague understanding of field effect tubes, so let's talk about what a field effect tube is.

Field effect tube is an electronic component, a semiconductor device that controls the electric field effect of the input circuit, so it is usually called a field effect tube. The origin of the field effect tube was proposed by the team of Liyes Edgar Lilienfeld. The mechanism was discovered and explained in the laboratory. In the 1920s, field effect tube semiconductor devices developed. In 1959, the metal oxide semiconductor field effect transistor invented by Sanhu Dawin Kahn and Martin Atala largely replaced the junction field effect tube and had a profound impact on the development of digital electronics.

Field effect transistors are generally divided into two categories, one is the N-channel junction field effect transistor and the other is the P-channel junction field effect transistor. In the n-channel, the field effect transistor is a depletion-type device. If the active area is expanded to be completely closed, the resistance of the channel will increase from the source and drain. At this time, the voltage will be pinched off. This voltage is called the pinch-off voltage. On the contrary, the positive gate-source voltage will be positively added to the relevant size, allowing electrons to flow easily. At this time, the field effect transistor will be effectively turned on and off like a switch. In the n-channel "enhancement" device, there will be no conductive channel in the field effect transistor. The positive voltage will attract enough biological electrons near the gate to offset the field effect transistor ions, forming a depletion layer. The further increase of the gate-source voltage will form a conductive channel. This process is called inversion. In the p-channel, the electrons are pressed from the gate to the gate-insulator/semiconductor interface to widen the depletion layer, which will carry countless carrier regions. On the contrary, in the p-channel, there is no pure conductive channel, so it is necessary to strengthen the negative voltage to conduct electricity.

Field effect tubes are also widely used. They can be used for amplification. Because the impedance of field effect tubes is very high, electrolytic capacitors are not needed. Field effect tubes are mostly used for impedance conversion because of their high impedance. Field effect tubes can be used as variable resistors, which can be used as constant current sources more conveniently. Field effect tubes can also be used as electronic switches.

Shenzhen Mengke Electronic Technology Co., Ltd. is a company that produces and researches field effect tubes. The development company's business scope includes: general business projects: technical development, production, processing and sales of diodes, triodes and electronic components; it can meet the needs of customers very well. If there is a need for related field effect tubes, offline consultation or online communication can be carried out.