Patent ID: 7746610
Filing Date: 2010-06-29
Classification: H02H

Abstract:
1. A device for discharging static electricity, comprising: a discharge part which is coupled between an input/output pad and a ground voltage line to form a discharge path, discharging an electrostatic current introduced to the input/output pad; and an amplification circuit, which is coupled in parallel with the discharge part and which supplies a sense amplification signal that is generated by amplifying the electrostatic current as a control signal of the discharge part, wherein the amplification circuit comprises: a drive control circuit, which comprises a first NMOS transistor, the drain of which is coupled to the input/output pad and a gate is coupled to a first node, and a first resistor of which one end is coupled to the ground voltage line and the other is coupled to a source of the first NMOS transistor, and which detects a detection voltage generated at a second node commonly connected with the first NMOS transistor and the first resistor; and a drive part which comprises a second NMOS transistor, the drain of which is coupled to the input/output pad and a source is coupled to the first node and a gate is coupled to the second node, and which is operated by the detection voltage to generate the sense amplification signal amplified corresponding to an electrostatic current and provide it to the first node.