A screen-like or spiral electrode composed of metal wires. One or more electrodes arranged between the anode and cathode of a multipolar electron tube have the shape of a wire mesh or a spiral, which plays a role in controlling the electric field intensity on the cathode surface, thereby changing the electrons emitted by the cathode or capturing secondary electrons.

The names of these terminals are related to their functions. A door can be thought of as a switch that controls a physical door. The gate can allow or hinder the flow of electrons by forming or eliminating a channel between the source and the drain. If affected by the applied voltage, the electron flow will flow from the source to the drain. The bulk simply refers to the bulk of the semiconductor where the gate, drain and source are located. Generally, the body terminal is connected to the highest or lowest voltage in the circuit, which varies according to the type. The body terminal and the source are sometimes connected together because sometimes the source is also connected to the highest or lowest voltage in the circuit. Of course, FETs in some circuits sometimes do not have such a structure, such as cascaded transmission circuits and cascaded circuits.

Step 2 drain

Field effect transistor (FET) is short for field effect transistor.

General transistors are called bipolar transistors because they are conducted by carriers with two polarities, namely, majority carriers and minority carriers with opposite polarities, while FET is only conducted by majority carriers, which is contrary to bipolar transistors and is also called unipolar transistors.

An electrode is led out at both ends of the N-type silicon wafer, which is called source and drain respectively, and the thin N region is called conductive channel. Common-drain amplifier circuit-source output device

3. Source electrode

Short for field effect transistor. General transistors are called bipolar transistors because they are conducted by carriers with two polarities, namely, majority carriers and minority carriers with opposite polarities, while FET is only conducted by majority carriers, which is contrary to bipolar transistors and is also called unipolar transistors.

References:

Baidu Encyclopedia-Grid

Baidu encyclopedia-drainage

Baidu encyclopedia-Yuanji