Electrostatic discharge protection circuit
AssigneeVIA Technologies, Inc.
InventorsBob Cheng, Tony Ho, Bouryi Sze
Life of this patent
Estimating the term…
Abstract
An electrostatic discharge protection circuit has a substrate; a first P-well installed on the substrate and having a first P+-doped region and a first N+-doped region, both of which are connected to ground; a second P-well installed on the substrate and having a second P+-doped region and a second N+-doped region, both of which are connected to a power supply voltage; and a third P-well installed on the substrate and having a third N+-doped region, a third P+-doped region, and a fourth N+-doped region, all of which are for input/output signals.
Claims12
An electrostatic discharge protection circuit for a broadband circuit, the electrostatic discharge protection circuit comprising:
- a first electrostatic discharge protection unit for electrically connecting to pins of an integrated circuit chip of the broadband circuit;
- a second electrostatic discharge protection unit for electrically connecting to an inner circuit of the broadband circuit;
- and
- at least a third electrostatic discharge protection unit installed between the first electrostatic discharge protection unit and the second electrostatic discharge protection unit;
- wherein the first electrostatic discharge protection unit, the third electrostatic discharge protection unit and the second electrostatic discharge protection unit are electrically connected in series, and either of the first electrostatic discharge protection unit and the second electrostatic discharge protection unit has a capacitance value larger than that of the third electrostatic discharge protection unit.
An electrostatic discharge protection circuit for an ultra broadband circuit, the electrostatic discharge protection circuit comprising:
- a first electrostatic discharge protection unit for electrically connecting to pins of an integrated circuit chip of the ultra broadband circuit;
- a second electrostatic discharge protection unit for electrically connecting to an inner circuit of the ultra broadband circuit;
- a third electrostatic discharge protection unit electrically connected to the first electrostatic discharge protection unit and to the second electrostatic discharge protection unit;
- and
- a fourth electrostatic discharge protection unit electrically connected to the third electrostatic discharge protection unit;
- wherein either of the first electrostatic discharge protection unit and the second electrostatic discharge protection unit has a capacitance value larger than that of the third electrostatic discharge protection unit, and the third electrostatic discharge protection unit has a capacitance value larger than that of the fourth electrostatic discharge protection unit.
Dependencies are inferred from the claim text.