Integrated Circuit Efuse Programming Damage Detection

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Solution Overview

Problem

Conventional techniques for evaluating efuse programming damage in integrated circuits are time-consuming, expensive, and destructive, and fail to detect soft failures such as inter-layer current leakage or metal migration, which can lead to circuit damage and reliability issues.

Innovation Solution

Incorporating a damage detection structure within the integrated circuit, such as a field-effect transistor or diode, to detect damage during efuse programming, and using testing equipment to evaluate the damage detection structure, allowing for the identification of latent defects and optimization of programming parameters.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If conventional evaluation techniques (SEM, cross-section processing) are used to detect efuse programming damage, then damage identification is possible, but the process becomes time-consuming, expensive, and destructive

Engineering Contradiction:

Improvedamage detection capabilityVSAvoidevaluation time

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The patent incorporates damage detection structures (such as sensor circuits or indicator elements) into the IC during manufacturing, before efuse programming occurs. These pre-integrated structures are designed to automatically indicate damage conditions, eliminating the need for time-consuming post-programming analysis and enabling rapid evaluation without destroying the device.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The damage detection structures are designed to automatically detect and indicate damage conditions without requiring external analysis equipment or complex processing. The structures self-monitor critical areas and provide direct feedback about damage states, making the evaluation process simple, fast, and non-destructive.

Inventive Principle:

Principle #25Self-service

2Measurement precision

If conventional evaluation techniques are used, then some damage can be identified, but soft failures (inter-layer current leakage, metal migration) cannot be detected

Engineering Contradiction:

Improvedamage detection capabilityVSAvoiddetection of soft failures

Core Design Contradiction:

Measurement precisionVSReliability

Solution Approach 1:

The patent employs multiple specialized damage detection structures positioned at different locations and designed to detect different types of damage. Each structure has specific sensitivity to particular failure modes (such as current leakage paths or metal migration), enabling comprehensive detection of both hard and soft failures that would be invisible to conventional techniques.

Inventive Principle:

Principle #3Local quality

3Productivity

If efuse programming is performed to change resistance state, then memory function is achieved, but damage to front-end or back-end structures can occur

Engineering Contradiction:

Improveprogramming efficiencyVSAvoidprogramming-induced damage

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent integrates damage detection structures that provide real-time or post-programming feedback about damage conditions. This feedback mechanism allows operators to identify programming-induced damage immediately, adjust programming parameters to prevent further damage, and determine whether the IC remains functional, thereby optimizing the balance between programming efficiency and device integrity.

Inventive Principle:

Principle #23Feedback

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

Enables efficient detection of efuse programming damage without destroying the IC, allowing for the identification of soft failures and optimization of programming conditions, thereby improving the reliability and longevity of integrated circuits.

Implementation Method 1

at a fuse current level (IFUSE) the stripe of conducting material is thermally destroyed, thus changing the resistance of the efuse stripe

Methodology Applied

Scientific EffectElectrical Resistance: Electrical Resistance

Implementation Method 2

at a fuse current level (IFUSE) the stripe of conducting material is thermally destroyed

Methodology Applied

Scientific EffectJoule Heating: Joule Heating

Data Source

PatentUS7598749B1Integrated circuit with fuse programming damage detection

Publication Date: 2009.10.06 XILINX INC

AI summary

An integrated circuit with an efuse having an efuse link includes a damage detection structure disposed in relation to the efuse so as to detect damage in the IC resulting from programming the efuse. Damage sensing circuitry is optionally included on the IC. Embodiments are used in evaluation wafers to determine proper efuse fabrication and programming parameters, and in production ICs to identify efuse programming damage that might create a latent defect.