| 摘要 |
An Schmitt trigger with electrostatic discharge protection includes a first PMOS, a second PMOS, a first NMOS, and a second NMOS, which are connected in series and each of which has a gate coupled to an input terminal. The drain of the second PMOS is coupled to an output terminal. The source of the first PMOS is coupled to a first voltage. The source of the second NMOS is coupled to a second voltage. The Schmitt trigger further includes a third PMOS, which has a gate coupled to the output terminal, a source coupled to the drain of the first PMOS, and a drain coupled to the second voltage through a poly-silicon resistor; and a third NMOS which has a gate coupled to the output terminal, a source coupled to the source of the first NMOS, and a drain coupled to the first voltage through a poly-silicon resistor.
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