Patent ID: 6747501
Filing Date: 2004-06-08
Classification: H01L

Abstract:
An electrostatic discharge protection circuit, comprising:a clamping circuit including a first transistor, the first transistor having a drain, a source, a gate and a substrate; and a control circuit having a second transistor and at least one diode, said at least one diode having a first end and a second end, the second transistor being coupled to the first end of the at least one diode, wherein said control circuit is coupled to the clamping circuit, the control circuit being coupled to the gate and substrate of the first transistor and providing a first bias voltage signal to the gate of the first transistor and a second bias voltage signal to the substrate of the first transistor to trigger the clamping circuit to discharge an electrostatic current, and wherein the first bias voltage signal is greater than the second bias voltage signal, wherein the first bias voltage is greater than the second bias voltage.