Electrostatic discharge protection circuits
AssigneeVanguard International Semiconductor Corporation
InventorsYeh-Ning Jou, Geeng-Lih Lin
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Abstract
An electrostatic discharge (ESD) protection circuit is provided. A transistor is coupled between a node and a ground, and has a gate coupled to the ground. A diode chain is coupled between the node and a pad, and comprises a plurality of first diodes connected in series, wherein the first diode is coupled in a forward conduction direction from the pad to the node. A second diode is coupled between the node and the pad, and the second diode is coupled in a forward conduction direction from the node to the pad.
Claims20
An electrostatic discharge (ESD) protection circuit, comprising:
- a transistor coupled between a node and a ground, having a gate coupled to the ground;
- a diode chain coupled between the node and a pad, comprising a plurality of first diodes connected in series, and the first diode is coupled in a forward conduction direction from the pad to the node;
- and
- a second diode coupled between the node and the pad, and the second diode is coupled in a forward conduction direction from the node to the pad.
An electrostatic discharge (ESD) protection circuit, comprising:
- an N-type transistor coupled between a node and a ground, having a gate coupled to the ground;
- a first diode having a first anode and a first cathode, the first anode is coupled to a pad;
- a second diode having a second anode and a second cathode, the second anode is coupled to the first cathode and the second cathode is coupled to the node;
- and
- a third diode having a third anode and a third cathode, the third anode is coupled to the node and the third cathode is coupled to the pad.
An electrostatic discharge (ESD) protection circuit, comprising:
- a transistor coupled between a node and a ground, having a gate coupled to the ground;
- a diode chain coupled between the node and a pad, comprising a plurality of first diodes connected in series;
- and
- a second diode coupled between the node and the pad, wherein the first diode is conducted in a forward direction from the pad to the node when a first voltage of the pad is greater than a second voltage of the node, and the second diode is conducted in a forward direction from the node to the pad when the second voltage is greater than the first voltage.
Dependencies are inferred from the claim text.