Patent ID: 9627885
Date: 2017-04-18
CPC Classifications: H02H

Claim:
1. An electrostatic discharge (ESD) protection circuit, comprising: a plurality of resistors, wherein a first node of each resistor is connected to a first supply voltage, and a second node of each of at least a portion of the resistors is selectively connected to an input node via a corresponding switch; at least a capacitor, wherein a first node of the capacitor is connected to a second supply voltage, and a second node of the capacitor is connected to the input node; a driving circuit, connected to the input node, arranged to generate a driving signal according to a voltage of the input node; and an ESD clamping device, coupled to the driving circuit and connected between the first supply voltage and the second supply voltage, wherein the ESD clamping device is arranged to selectively bypass an ESD current according to the driving signal; wherein the ESD protection circuit is disposed in a chip, and the ESD protection circuit further comprises: