What is MOS tube field effect?

 What is a FET?

The FET type is a semiconductor device that uses the electric field effect of the input loop to control the current of the output loop, and is named after this. Because it relies on the majority of carriers in the semiconductor to conduct electricity, it is also called a unipolar transistor. It distinguishes transistors, which use a small base current to control a large collector current. Also known as   bipolar transistor.  

 One, Type of MOS tube, 1JFET junction field effect tube----Using the reverse voltage of PN junction to control the thickness of the depletion layer to change the conduction The width of the channel, thereby controlling the magnitude of the drain current. Junction FETs are generally depletion-type.     

Characteristics of depletion: 

a, PN junction reverse voltage, how to understand this is that there is a PN junction between the gate G, the drain D and the source s,

b, when no gate voltage is applied, the device is turned on. A certain negative pressure must be applied to turn the device off.  

C, in principle, the drain D and the source S are not distinguished, that is, the drain can also be used as a source, and the source can also be used as a drain. There is an on-resistance between drain and source.     

2IGFET insulated gate field effect transistor----Using the size of the gate-source voltage to change the amount of charge induced on the surface of the semiconductor, thereby controlling the size of the drain current.  

Enhanced Effect Tube Features: 

A, when the gate and source voltages are 0, the tube with 0 drain current is enhanced.

B, The gate-source voltage, there is an insulating layer between this, and the insulating gate type generally uses the SIO2 insulating layer.      

The performance characteristics of depletion-mode insulated gate field effect transistors are: when the gate voltage U. =0 there is a certain drain current. For N-channel depletion-mode insulated gate field effect transistors, the drain