Die Ring Conductor Switching for Chip Crack Isolation Control
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Solution Overview
Problem
Semiconductor devices face challenges in detecting and managing cracks on the periphery of chips during dicing, which can lead to die ring isolation and potential malfunctions, especially when power supplies for different channels are independent and not coupled.
Innovation Solution
The semiconductor device incorporates a die ring with bifurcated sections coupled to die ring controllers and buffer circuits via switches, allowing for independent operation of channels and automatic control of the die ring, even if one channel is defective, using a configuration of polysilicon and metal layers to detect isolation and maintain functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If power supplies for different channels are made independent, then channel isolation and reliability are improved, but die ring control capability is worsened when one channel fails
Solution Approach 1:
The power supply system is segmented into independent channel power supplies (first power supply and second power supply) that can operate independently. Each channel has its own power supply unit, allowing one channel to fail without affecting the other channel's operation and die ring control capability.
Solution Approach 2:
The die ring is coupled to both channel power supplies through switching mechanisms, merging the control paths. This allows either power supply to control the die ring depending on which channel is operational, ensuring continuous die ring functionality even when one channel fails.
2Measurement precision
If die ring is isolated during dicing, then crack detection capability is improved, but device functionality is worsened due to loss of die ring control
Solution Approach 1:
The die ring is pre-configured with coupling paths to multiple power supplies and control circuits before dicing occurs. Switching mechanisms are pre-established so that when the die ring is isolated during dicing, the system can automatically switch to an alternative power supply or control path to maintain functionality.
Solution Approach 2:
Switching circuits and control logic act as intermediaries between the die ring and power supplies. These intermediaries enable the system to detect die ring isolation during dicing while maintaining the ability to restore die ring functionality by switching to alternative control paths.
3Device complexity
If die ring control is centralized to one channel, then control simplicity is improved, but system reliability is worsened when that channel fails
Solution Approach 1:
The die ring control structure is made dynamic through switching mechanisms that can reconfigure control paths based on channel status. When one channel fails, the system dynamically switches die ring control to the other channel, maintaining system reliability without requiring a permanently complex dual-control architecture.
Data Source
AI summary
An apparatus that includes first and second circuit blocks integrated on a semiconductor chip, and a die ring conductor provided along edges of the semiconductor chip so as to surround the first and second circuit blocks. The first circuit block includes a first die ring controller. The second circuit block includes a second die ring controller. One of the first and second die ring controllers is coupled to the die ring conductor such that another of the first and second die ring controllers is isolated from the die ring conductor.