Method and aparatus for improved electrostatic discharge protection

An electrostatic discharge, voltage power supply technology, applied in emergency protection circuit devices, emergency protection circuit devices, circuits, etc. for limiting overcurrent/overvoltage, which can solve problems such as current increase, silicon area increase, driver failure, etc.

Inactive Publication Date: 2009-02-04
SARNOFF CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, firstly, by increasing the size of the ESD will significantly increase the silicon area consumed for this ESD protection, and secondly, by increasing the size of the ESD clamp, driver size and bus voltage drop for the same line resistance, the required current will increase
In this case, the driver may fail if it cannot handle this extra current

Method used

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  • Method and aparatus for improved electrostatic discharge protection
  • Method and aparatus for improved electrostatic discharge protection
  • Method and aparatus for improved electrostatic discharge protection

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Embodiment Construction

[0036]The present invention provides an improved inter-domain protection technique for ESD protection of interfaces between different power domains on an IC. In particular, the invention proposes a solution to increase the current through the interface lines, and thus increase the voltage drop on the lines, without changing the line drivers themselves. A method is also proposed to increase the impedance of the interface lines during ESD and thus increase the voltage drop across them. The increase of the voltage on the interface line improves the design margin of the ESD protection strategy, and thus provides better ESD protection capability for the IC product.

[0037] In one embodiment of the invention, figure 2 A general implementation of the first embodiment of the improved inter-domain ESD protection circuit 200 is shown. ESD protection circuit 200 includes several elements similar to circuit 100, but is not limited to resistor 105, and may be any impedance device 205 of...

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Abstract

The invention relates to a method of improving electrostatic discharge protection and a device. An apparatus has an inter-domain electrostatic discharge (ESD) protection circuit for protection of an integrated circuit (IC) with multiple power domains. The protection circuit in response to an ESD event provides an ESD protection between different power domains. Specifically, the protection circuit comprises at least one clamp coupled to one power domain, which conducts current during an ESD event to provide extra current in the interface line between the two different power domains. This extra current also in turn increases the voltage over the impedance element on the interface line, thus improving the design margins for the ESD protection and providing a better ESD protection capability for IC products.

Description

[0001] cross reference [0002] This patent application claims the benefit of US Provisional Application No. 60 / 893,670, filed March 8, 2007, the contents of which are incorporated herein by reference. technical field [0003] The present invention relates generally to circuits providing electrostatic discharge protection, and more particularly to methods and apparatus for providing ESD protection of interfaces between different power domains. Background technique [0004] In the prior art, when protecting an IC with multiple power domains against ESD stress, the IO cells are protected. However, the voltage difference between the different power domains can be so large during stress that also the interfaces between the different domains within the core circuit need to be protected. This is especially the case for the stress of the charging device model (CDM). One way to protect the interface between different power domains is by providing what is known as inter-domain prot...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H9/00H02H9/04
CPCH01L27/0251
Inventor P·万萨科尔O·马瑞查尔B·索尔格洛斯B·柯宾斯J·V·D·博特
Owner SARNOFF CORP
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