Yuansheng Da teach you how to distinguish the MOS transistor P tube and N tube

Field effect tube (MOS)Although it's not the most important part of the circuit But it is also a very important device, which can be divided intoNChannel sumPChannels are indistinguishable from their appearance, so how do we distinguish them? The following introduction2The most common way to distinguish.

First of all we can look at itPtypeMOSFETandNtypeMOSFETThe structure of the following figure is shown:

1.forPtypeMOSFETThe anode of the parasitic diode is connected with the drain electrode, and the cathode is connected with the source electrode; And forNtypeMOSFETThe anode of the parasitic diode is connected with the source pole, and the cathode is connected with the drain pole.PtypeMOSFETandNtypeMOSFETThe anode and cathode connections of the volume diode are just opposite. Use a multimeter to test the connection between the anode and cathode of the parasitic diode and the drain-source electrode, it can be distinguished.

2.Another distinctionMOSFETisPType orNThe type of approach is to look at the openingMOSFET, whether the gate to the source requires a positive level or a negative level. forNtypeMOSFETTo turn it on, the gate to the source (VGSAdd a positive voltage (the voltage needs to be higher than thisMOSFETThreshold voltage of

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