Patent ID: 8482891
Filing Date: 2013-07-09
Classification: H02H

Abstract:
1. An electrostatic discharge (ESD) protection circuit, having a first node for receiving an input voltage, the protection circuit comprising: a voltage-divider generating circuit, coupled to the first node wherein the voltage-divider generating circuit outputs a first voltage and a second voltage and the transient voltages of the first and the second voltage are different when the input voltage is under a transient period; a decision circuit, coupled to the voltage-divider generating circuit, wherein the decision circuit includes a first switch and a second switch being coupled to the first switch to form a node for outputting the output voltage, and the first switch and the second switch receive the first voltage and the second voltage separately to determine the voltage level of an output voltage according to the first voltage and the second voltage; and a switching circuit, coupled to the node for outputting the output voltage of the decision circuit and either being turned on or turned off according to the output voltage on the node for outputting the output voltage; wherein the voltage-divider generating circuit comprises: a first resistor, one end of which is coupled to the first node; a second resistor, coupled to the other end of the first resistor in series wherein the decision circuit is coupled to a second node which is between the second resistor and the first resistor; and a capacitor, coupled to the second resistor wherein the decision circuit s coupled to a third node which is between the second resistor and the capacitor.