Power Source Tolerance Analysis for 3D IC PDN
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Solution Overview
Problem
The low process yield and increased production cost of three-dimensional integrated circuits due to the reliability issues in the power delivery network (PDN) caused by through-silicon vias (TSVs) and bumps necessitate a method to simulate and identify potential power source faults for subsequent repair or reinforcement.
Innovation Solution
A power source tolerance analysis method and system that performs voltage drop analysis on multiple power sources in the PDN, sorts their supply currents, and selects target power sources based on the sorted results to identify potential fault points, thereby enhancing PDN reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If three-dimensional integrated circuit technology with TSVs and bumps is used to reduce routing length and signal transmission time, then the integration density and signal transmission speed are improved, but the process yield decreases and production cost increases due to reliability issues in the power delivery network
Solution Approach 1:
The patent performs voltage drop analysis and identifies critical power sources before the actual manufacturing process. By analyzing the PDN design data and simulating voltage drops under various conditions, the system determines which power sources are most likely to cause reliability issues, allowing preventive measures to be taken in the design stage rather than dealing with failures after manufacturing
Solution Approach 2:
The patent segments the power delivery network into multiple individual power sources and analyzes each one separately. By calculating voltage drops for each power source independently and ranking them by criticality, the system can identify specific problematic power sources without having to analyze the entire complex PDN as a single unit, making the reliability assessment more manageable and precise
2Productivity
If process yield of TSVs and bumps is low, then manufacturing complexity increases, but the power delivery network reliability deteriorates
Solution Approach 1:
The system performs comprehensive voltage drop analysis and identifies critical power sources before manufacturing. By simulating various process conditions and identifying which power sources are most sensitive to manufacturing variations, the system allows designers to optimize the PDN layout and select more reliable power source locations in advance, potentially improving both yield and reliability
3Reliability
If voltage drop analysis is performed on all power sources to identify critical ones, then the reliability of the power delivery network is improved, but the computational complexity and analysis time increase
Solution Approach 1:
The patent divides the power delivery network into multiple individual power sources and analyzes each one separately. By calculating voltage drops for each power source independently and then ranking them by criticality, the system reduces the complexity of analyzing the entire PDN at once. This segmented approach allows for systematic identification of critical power sources without overwhelming computational burden
Solution Approach 2:
The patent extracts and focuses on the most critical power sources from the complete set of power sources in the PDN. By ranking power sources based on their voltage drop characteristics and identifying only the critical ones, the system extracts the essential information needed for reliability improvement without requiring detailed analysis of every single power source, thus reducing overall analysis complexity
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 method effectively identifies critical power sources that may cause voltage drops, allowing for targeted reinforcement or repair, thereby improving the reliability and reducing production costs of the PDN in integrated circuits.
Implementation Method 1
performing a voltage drop analysis on a plurality of power sources in a power delivery network (PDN) to determine respective supply currents of the power sources
Data Source
AI summary
A power source analysis method includes receiving a target number, performing voltage drop analysis on a plurality of power sources in a power delivery network (PDN) to determine respective supply currents of the power sources, sorting the supply currents of the power sources, and selecting a plurality of target power sources from the power sources according to a sorted result. The total number of the selected target power sources equals the target number.