Semiconductor Package Layout for Strain-Induced Shift Mitigation
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Solution Overview
Problem
Semiconductor packages face challenges in accurately measuring and mitigating strain-induced shifts in strain-sensitive components like thin-film resistors, which require complex mathematical calculations and multiple arrays, making them impractical for circuits sensitive to global strain.
Innovation Solution
The layout and orientation of strain-sensitive components on a semiconductor die are strategically selected to balance strain-induced shifts, using an orthogonal package-induced strain ratio, which offsets longitudinal and transverse shifts without requiring multiple arrays or complex calculations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If combinations of diffused resistors are used to extract strain components, then strain measurement capability is improved, but circuit complexity and post-processing calculation complexity increase
Solution Approach 1:
The patent extracts only the essential strain measurement function by using a single diffused resistor with specific orientation, eliminating the need for complex resistor combinations and post-processing calculations while maintaining strain measurement capability
Solution Approach 2:
Instead of using multiple resistors to measure strain components and then calculating through complex mathematics, the patent inverts the approach by orienting a single resistor to directly experience the principal strain, converting a complex measurement problem into a simple direct measurement
2Reliability
If multiple arrays of components are used to offset strain gradient effects, then strain compensation is improved, but device complexity and manufacturing complexity increase
Solution Approach 1:
The patent applies local quality by positioning a single strain-sensitive component at the specific location where principal strain occurs, creating a localized optimal measurement point rather than using multiple components across the device
Solution Approach 2:
The patent uses a single representative component that copies the essential strain experience of the entire device structure, eliminating the need for multiple arrays while maintaining compensation effectiveness
3Stability of the object's composition
If strain-sensitive components are placed near the center of the semiconductor die, then strain uniformity is improved, but measurement accuracy for principal strain directions decreases
Solution Approach 1:
The patent performs preliminary action by pre-calculating and identifying the principal strain directions and magnitudes for the specific package structure, then using this information to optimally orient the strain-sensitive component before manufacturing
Solution Approach 2:
The patent changes the orientation parameter of the strain-sensitive component to align with the principal strain direction, transforming the measurement from detecting uniform but directionless strain to detecting directional principal strain with high precision
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
This approach effectively mitigates strain-induced variations in semiconductor packages, providing consistent outputs across a range of strains without the need for complex measurements or additional components, enhancing the reliability of strain-sensitive components.
Implementation Method 1
a parameter of the strain-sensitive component exhibits a longitudinal shift due to a longitudinal strain and a transverse shift due to a transverse strain
Data Source
AI summary
A semiconductor package includes a semiconductor die including a semiconductor substrate, a strain-sensitive component located within or over a metallization layer of the semiconductor die, wherein a parameter of the strain-sensitive component exhibits a longitudinal shift due to a longitudinal strain and a transverse shift due to a transverse strain, and a mold compound covering the semiconductor die and the strain-sensitive component. The semiconductor package, including the semiconductor die and the mold compound, defines an orthogonal package-induced strain ratio on the strain-sensitive component on the semiconductor die surface. The strain-sensitive component is located such that the longitudinal shift due to package-induced strains offsets the transverse shift due to the package-induced strains.