Semiconductor Die Metal Reinforcement for Frequency Stability
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Solution Overview
Problem
Conventional relaxation oscillators using resistors and capacitors to determine frequency are prone to performance variance due to temperature-induced strain, leading to unpredictable frequency responses, as they lack mechanical reinforcement to stabilize the integrated circuitry.
Innovation Solution
The method involves placing a metal material to laterally surround regions of integrated circuitry on a semiconductor die, with the metal material extending to a maximum height that exceeds other structures, and encapsulating both the metal and die in an encapsulant material, thereby providing mechanical reinforcement and maintaining consistent frequency across temperature ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional relaxation oscillators use resistors and capacitors to determine frequency without mechanical reinforcement, then device complexity is reduced, but frequency stability and reliability deteriorate due to temperature-induced strain
Solution Approach 1:
The patent divides the semiconductor die into multiple segments by laterally surrounding specific integrated circuitry regions with metal material. This segmentation isolates temperature-sensitive oscillator circuits from thermal strain, allowing frequency-stable operation without requiring complete structural reinforcement of the entire die.
Solution Approach 2:
The patent applies mechanical reinforcement selectively only to regions containing temperature-sensitive integrated circuitry (such as relaxation oscillators) rather than uniformly reinforcing the entire semiconductor die. This localized approach provides necessary frequency stability while minimizing additional device complexity and material usage.
2Reliability
If metal material is placed around integrated circuitry regions to provide mechanical reinforcement, then frequency stability improves, but manufacturing complexity increases
Solution Approach 1:
The patent performs mechanical reinforcement by placing metal material around integrated circuitry regions during the semiconductor manufacturing process itself, before final packaging. This preliminary action integrates the reinforcement step into existing manufacturing workflows, avoiding the need for separate post-packaging modification steps and reducing overall manufacturing complexity.
3Reliability
If crystal components are used to ensure frequency stability, then reliability improves, but device complexity and cost increase
Solution Approach 1:
The patent replaces the mechanical crystal oscillator component with an integrated circuitry-based relaxation oscillator that uses resistors and capacitors. By substituting the external crystal component with an integrated solution and providing it with mechanical reinforcement through metal material, the patent achieves comparable frequency stability while reducing device complexity and eliminating the need for separate crystal components.
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 ensures that the actual frequency of relaxation oscillators remains within 0.25% of the target frequency from -40°C to 94°C, enhancing precision and reducing production costs by eliminating the need for crystal components, making them suitable for various applications including internal and external clock functions in microcontrollers.
Implementation Method 1
temperature-induced strain
Data Source
AI summary
Methods of making a semiconductor device packages may involve placing a metal material at least partially around a region of integrated circuitry embedded within an active surface of a semiconductor die, the metal material located on the active surface. At least a portion of the metal material may be left electrically disconnected from the region of integrated circuitry. The semiconductor die and the metal material may be encapsulated in an encapsulant material, the encapsulant material extending to a height above the active surface higher than a maximum height of the metal material above the active surface.