CPC H02H 9/046 (2013.01) [H01L 27/0255 (2013.01); H01L 27/0266 (2013.01); H01L 27/0288 (2013.01)] | 20 Claims |
1. An integrated circuit (IC) with electrostatic discharge (ESD) protection, comprising:
a signal pad, configured to receive an input signal during a normal mode, and receive an ESD signal during an ESD mode;
an internal circuit, configured to process the input signal during the normal mode;
a variable impedance circuit, comprising a first end coupled to the signal pad, a second end coupled to the internal circuit, and a control end, wherein the variable impedance circuit provides a low impedance path between the signal pad and the internal circuit during the normal mode, and provides a high impedance path between the signal pad and the internal circuit during the ESD mode; and
a switch circuit, comprising a first end coupled to the control end of the variable impedance circuit, a second end coupled to a reference voltage terminal, and a control end configured to receive a node voltage, wherein the switch circuit is configured to switch the control end of the variable impedance circuit to have a first specific voltage during the normal mode, and to switch the control end of the variable impedance circuit to be electrically floating during the ESD mode.
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