brief introduction: N-channel MOS transistor: Metal-oxide-semiconductor transistor for short, there are P type MOS tube and N type MOS tube.The integrated circuit formed by MOS tube is called MOS integrated circuit, and the complementary MOS integrated circuit formed by PMOS tube and NMOS tube is called CMOS integrated circuit.MOS tube N channel P channel differentiation: judge the channel type, and then judge the polarity of the three legs; judge the channel, and then judge the polarity of the three legs.How to di