ESD Protection Modules with Resistive Network and Common Layer

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Solution Overview

Problem

Existing ESD protection technologies are inefficient in triggering for both weak and strong electrostatic discharges, often resulting in dead zones and overvoltage peaks due to inconsistent triggering and sizing of protection circuits.

Innovation Solution

A semiconductor device with multiple modules connected by a resistive network and a common semiconductor layer, each module sized for saturation during ESD, sharing excess current through a single triggering circuit to ensure fast and effective triggering of all modules, reducing the risk of dead zones.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a single large-sized triac protection circuit is used, then strong ESD discharges are absorbed effectively, but weak ESD discharges cannot be triggered rapidly

Engineering Contradiction:

Improveprotection effectiveness against strong ESDVSAvoidtriggering speed for weak ESD

Core Design Contradiction:

ReliabilityVSSpeed

Solution Approach 1:

The protection device is divided into multiple protection modules (at least two), each containing a triggerable element. This segmentation allows each module to be optimized for different ESD strength levels, with smaller modules responding quickly to weak discharges and the system collectively handling strong discharges effectively.

Inventive Principle:

Principle #1Segmentation

2Speed

If several smaller ESD protection circuits are used, then weak ESD discharges are protected efficiently, but strong ESD pulses cannot be handled effectively due to inconsistent triggering

Engineering Contradiction:

Improvetriggering speed for weak ESDVSAvoidprotection effectiveness against strong ESD

Core Design Contradiction:

SpeedVSReliability

Solution Approach 1:

Multiple protection modules are merged into a single integrated device with shared components. The triggerable elements share a common semiconductor layer and are connected through resistive networks, ensuring coordinated operation and consistent triggering across all modules during strong ESD events.

Inventive Principle:

Principle #5Merging (Combining)

3Device complexity

If triggerable elements have different anode-cathode distances, then device complexity is reduced, but dead zones appear between consecutive triggerings

Engineering Contradiction:

Improveuniformity of module structureVSAvoidcontinuous protection during ESD event

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

Resistive networks are introduced as intermediary elements connecting the protection modules in series between the first and second terminals. These resistive networks ensure proper voltage distribution and sequential triggering of modules, eliminating dead zones by maintaining continuous protection coverage during ESD events.

Inventive Principle:

Principle #24Intermediary (Mediator)

4Reliability

If multiple protection modules are used, then coverage of different ESD strengths is improved, but device area increases

Engineering Contradiction:

Improveprotection coverage for various ESD levelsVSAvoiddevice area

Core Design Contradiction:

ReliabilityVSArea of stationary object

Solution Approach 1:

The protection modules are arranged in a nested or compact configuration where components are shared and optimized. The common semiconductor layer and shared resistive networks allow multiple protection functions to be integrated in a compact area, reducing the overall device footprint while maintaining comprehensive protection coverage.

Inventive Principle:

Principle #7Nested doll (Nesting)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The solution provides rapid and effective protection against both weak and strong ESD discharges while minimizing the risk of module breakdown and overvoltages, allowing for compact design without the need for guard rings.

Implementation Method 1

The modules are connected between two terminals by the intermediary of a resistive network

Methodology Applied

Scientific EffectElectrical Resistance: Electrical Resistance

Implementation Method 2

An electrostatic discharge (ElectroStatic Discharge: ESD) results, for example, in a current peak of 30 amps in one nanosecond followed by a current of 10 amps over 10 nanoseconds

Methodology Applied

Scientific EffectElectrostatic Discharge: Electrostatic Discharge

Data Source

PatentUS9455247B2High-performance device for protection from electrostatic discharge

Publication Date: 2016.09.27 STMICROELECTRONICS FRANCE

AI summary

A semiconductor device for protection from electrostatic discharge includes a number of modules for protection from electrostatic discharge. Each module includes a thyristor having terminals and a gate, and a diode coupled in antiparallel to the terminals of the thyristor. Each module is sized to share a saturation current with neighboring modules when an electrostatic discharge current is received. A resistive network couples modules between two terminals. A triggering circuit includes a common triggering output that is coupled to the gate of the thyristor of each module and a common buried semiconductor layer contacts each module.