公开(公告)号：EP3817048A1

公开(公告)日：2021-05-05

申请号：EP20204913.6

申请日：2020-10-30

Applicant: RichWave Technology Corp.

Inventor： Chao, Chuan-Chen ,  Pai, Ching-Yao

IPC: H01L27/02 ,  H02H9/04

Abstract: An integrated circuit (10) includes a signal pad (100), receiving an input signal during a normal mode, and receive an ESD signal during an ESD mode; an internal circuit (102), processing the input signal during the normal mode; a variable impedance circuit (104), comprising a first end coupled to the signal pad (100), a second end coupled to the internal circuit (102), and providing a low or high impedance path between the signal pad (100) and the internal circuit (102) during the normal or ESD mode; and a switch circuit (106), comprising a first end coupled to a control end of the variable impedance circuit (104), and a control end receiving a node voltage (Vn), wherein the switch circuit (106) switches the control end of the variable impedance circuit (104) to have a first specific voltage or be electrically floating during the normal or ESD mode.