Performance of MOS transistor 25n120 of asemi in different application scenarios

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According to its application mode ,MOS tube 25N120 The main function of ：

1、 Make a magnifying tube ;

2、 Make high-speed pipe ;

3、 Make a current mirror tube ;

4、 Make the switch .

25N120 Parameters to describe

model ：25N120

encapsulation ：TO-247

Collector - Emitter voltage （VCES）：1200V

Collector current （IC）：25A

Grid - Emitter voltage （VGES）：±20V

Power waste （PD）：310W

G-E Leakage current （IGES）：±100nA

G-E Threshold voltage （VGE(th)）：7.5V

Output capacitance （COSS）：180pF

Pulse collector current （ICM）：75A

Start delay time （td(on)）：60nS

Turn off delay time （td(off)）：170nS

MOS The size and voltage of the tube need to be set mainly include the following two types ：

1、 Grid length L;

2、 Over drive voltage Vgs-Vth

MOS tube 25N120 When used as an enlarged tube , For example, the input tube of the operational amplifier , The goal is to achieve higher gain , Therefore, it is used as a magnifying tube MOS Tubular L A bigger ,Vgs-Vth Be smaller .

When MOS tube 25N120 When used as high-speed pipe , Such as low noise amplifier 、 VCO 、 Mixer and other RF circuits , Its goal is to pursue high speed , The conclusion is diametrically opposite to that of the magnifying tube . To improve the circuit speed ,MOS The pipe shall be of the minimum process L And the larger Vgs-Vth. because L The bigger it is ,MOS The larger the parasitic capacitance of the tube , It will affect the high-speed performance of the pipe .

MOS tube 25N120 When used as a current mirror tube , Its goal is to achieve accurate replication of current . Because current replication is a static signal , No need for speed , therefore MOS Tubular L A bigger , because MOS Tubular L The bigger it is ,MOS The smaller the erley effect of the tube , The more accurate the current replication . At the same time, attention should be paid to the current current mirror pair Vds Whether it is equal or not , A working in the saturation zone MOS tube ,Vds identical ,L more , It can well realize current replication .

MOS tube 25N120 When used as a switch tube , Leakage source voltage Vds Should be very small ,MOST Working in linear area . In this area ,MOST A transistor is actually a small resistor , Provide linear volt ampere characteristics .