Electro-static discharge protective circuit containing grid voltage hoisting

A static discharge protection circuit including the function of lifting grid voltage is used as a static discharge protection circuit of a big size open drain electrode circuit and comprises a voltage source used for supplying voltage, a first PMOS coupled to the voltage source, a first NMOS coupled to the PMOS, a parasitic diode coupled to the PMOS, a second NMOS coupled to the drain electrode of the PMOS, a first parasitic capacitance coupled to the second NMOS, a second parasitic capacitance coupled to the first parasitic capacitance and the second NMOS, and a grid voltage lifting circuit coupled to the grid and source of the second NMOS. The static discharge protection circuit adopts the grid voltage lifting circuit to lift the grid voltage of a second N-shaped metal oxide semiconductor. The static discharge protection circuit including the function of lifting grid voltage can solve the problems such as too low grid voltage of NMOS, reduced performance of static discharge protection due to abnormal conduc