Heterogeneous SOP Stack for RF Noise and Thermal Management
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Solution Overview
Problem
Current small-form-factor (SFF) system-on-package (SOP) architectures face challenges in achieving improved performance, integrated thermal management, and interference mitigation, particularly in embedding RF functionalities and managing thermal and noise issues, which often increase costs and degrade performance due to the use of high-cost materials and conventional electromagnetic band-gap structures that consume space.
Innovation Solution
The solution involves a heterogeneous stack of high-performance and low-performance polymer layers with embedded heat dissipating elements, such as metal or directional conductors, and vertical and horizontal filtering structures to isolate RF noise and harmonics, allowing for efficient thermal management and reduced size, using materials like liquid crystal polymer (LCP) and low-cost ABF for efficient RF and digital signal distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high-performance materials are utilized to embed complex RF passive designs, then RF performance is improved, but manufacturing cost increases
Solution Approach 1:
The patent divides the SOP structure into distinct high-performance material layers and low-cost material layers. The high-performance materials (such as LCP) are used only in specific layers where RF performance is critical, while low-cost materials are used in other layers, thereby segmenting the material usage to optimize both performance and cost.
Solution Approach 2:
The patent applies different material qualities to different regions of the SOP structure. High-performance materials with superior RF characteristics are localized to specific layers and regions where RF signal integrity is most important, while other regions use cost-effective materials, achieving local optimization of both performance and cost.
2Object-affected harmful factors
If conventional electromagnetic band-gap structures are used for noise mitigation, then interference is reduced, but device size increases
Solution Approach 1:
The patent transitions from conventional planar electromagnetic band-gap structures to three-dimensional vertical filtering structures. By stacking filtering elements in the vertical dimension, the patent achieves effective noise mitigation without increasing the horizontal footprint of the device, thus reducing overall SOP size while maintaining interference reduction capabilities.
Solution Approach 2:
The patent embeds filtering structures within the vertical stack of the SOP architecture, nesting the noise mitigation functionality within the existing device layers. This integration allows the filtering structures to occupy vertical space rather than horizontal space, minimizing the overall device footprint.
3Ease of manufacture
If RF functionalities are embedded in low-cost material systems, then manufacturing cost is reduced, but RF performance degrades
Solution Approach 1:
The patent segments the material system into high-performance layers for RF-critical functions and low-cost layers for other functions. This segmentation allows the use of inexpensive materials overall while preserving RF performance in the specific layers where it matters most.
Solution Approach 2:
The patent creates a composite material system combining high-performance materials (such as LCP) and low-cost materials in a multi-layer structure. This composite approach leverages the superior RF properties of high-performance materials where needed while utilizing the cost-effectiveness of low-cost materials in other regions, achieving an optimal balance between performance and manufacturing cost.
4Temperature
If thermal management is integrated into the SOP structure, then heat dissipation is improved, but device complexity increases
Solution Approach 1:
The patent merges thermal management functionality with the existing SOP structure by integrating heat dissipating elements into the vertical stack. Rather than adding separate thermal management subsystems, the patent combines cooling functions with the structural layers, thereby improving heat dissipation while minimizing additional complexity.
Solution Approach 2:
The patent designs the vertical stack layers to serve multiple functions: structural support, signal transmission, and thermal management. The same layers that provide mechanical support and electrical connectivity also facilitate heat dissipation, thereby achieving thermal management without proportionally increasing device 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
This approach enables reduced size and cost while maintaining high RF performance, effective thermal management, and minimizing noise coupling and crosstalk, potentially eliminating the need for external heat sinks and enhancing the overall efficiency of SFF-SOP environments.
Implementation Method 1
heat dissipating elements configured for dissipating heat generating from one or more electronic components
Implementation Method 2
vertical and horizontal filtering structures to isolate RF noise and harmonics
Data Source
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Figure 3a
AI summary
According to various aspects of the present disclosure, an apparatus is disclosed that includes a small form factor mobile platform including a system-on-package architecture, the system-on-package architecture arranged as a stack of layers including: a first layer having a first conformable material; a second layer having a second conformable material; a third layer having a third material; and one or more electronic components embedded within the stack of layers, wherein the first conformable material, the second conformable material, or both are configured to allow high frequency signal routing.