The selection rules of MOS transistor and three-level transistor:

The selection rules of MOS transistor and three-level transistor:

(1) MOS transistor is a voltage control element, while the transistor is a current control element. When only a small amount of current is allowed to be taken from the signal source, MOS transistors should be selected; When the signal voltage is low and it is allowed to take more current from the signal source, a transistor should be selected.

(2) Monopolar devices mentioned in power electronics technology refer to devices that rely solely on one type of carrier to conduct electricity, while bipolar devices refer to devices that rely on two types of carriers to conduct electricity. MOS transistor are referred to as unipolar devices because they use a type of majority carrier conductivity, while triodes use both majority carrier and minority carrier conductivity. It is called a bipolar device.

(3) Some MOS transistor have interchangeable source and drain electrodes, and the gate voltage can also be positive or negative, providing better flexibility than transistors.

(4) MOS transistor can operate under very low current and voltage conditions, and their manufacturing process can easily integrate many MOS transistors onto a single silicon chip. Therefore, MOS transistors have been widely used in large-scale integrated circuits.

(5) MOS transistor have the advantages of high input impedance and low noise, making them widely used in various electronic devices. Especially using MOS transistors as the input stage of the entire electronic device can achieve performance that is difficult for ordinary transistors to achieve.

(6) MOS transistor are divided into two categories: red junction type and insulated gate type, and their control principles are the same.