RF Package Launch Structures for Impedance-Matched Bump and Ball Interfaces
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Solution Overview
Problem
Existing RF integrated device packages experience inefficiencies in the electrical interface between the integrated device die and the package substrate, leading to performance degradation due to mismatched impedances at the bump and ball interface regions, resulting in significant electrical energy loss.
Innovation Solution
The implementation of bump and ball launch structures that match the impedance of communication lines in the RF integrated device die with the impedance of the package substrate and system board, respectively, through the patterning of metal and dielectric layers to tune inductance and capacitance, thereby reducing parasitic losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional electrical interfaces are used between the integrated device die and package substrate, then the structure is simple and easy to manufacture, but impedance mismatch occurs causing significant electrical energy loss and performance degradation
Solution Approach 1:
The patent applies local quality by creating specialized launch structures with specific metal and dielectric layer configurations at the bump and ball interface regions. These localized structures have tuned inductance and capacitance values that differ from the rest of the package, providing impedance matching exactly where needed at the interfaces without complicating the entire package structure.
Solution Approach 2:
The patent changes physical parameters by adjusting the inductance and capacitance of the launch structures through controlled patterning of metal and dielectric layers. By modifying these electrical parameters, the impedance of the launch structures is matched to both the die communication lines and the package substrate, minimizing energy loss at the interfaces.
2Reliability
If impedance matching structures are added to reduce energy loss, then electrical performance improves, but manufacturing complexity increases
Solution Approach 1:
The patent merges the impedance matching function with the existing launch structures by integrating patterned metal and dielectric layers into the bump and ball interface regions. This combination approach allows impedance matching to be achieved without adding separate, discrete components, thereby maintaining ease of manufacture while improving electrical performance.
Solution Approach 2:
The patent applies preliminary action by pre-tuning the inductance and capacitance of the launch structures during the manufacturing process itself. The metal and dielectric layers are patterned in advance with specific geometries that provide the required electrical characteristics, eliminating the need for post-manufacturing adjustments or additional assembly steps.
3Manufacturing precision
If the launch structures are designed with precise impedance matching, then signal quality improves and VSWR decreases, but the design and fabrication complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the launch structures into distinct metal and dielectric layers with specific patterns. This segmentation allows independent optimization of each layer's contribution to the overall inductance and capacitance, enabling precise impedance matching while simplifying the fabrication process through standardized layer-by-layer construction.
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 significantly enhances the electrical performance of RF packages by minimizing energy loss and improving signal quality through precise impedance matching, achieving a voltage standing wave ratio (VSWR) of less than 3:1 in many cases.
Implementation Method 1
bump and ball launch structures that match the impedance of communication lines in the RF integrated device die with the impedance of the package substrate and system board
Implementation Method 2
reducing parasitic losses
Implementation Method 3
through the patterning of metal and dielectric layers to tune inductance and capacitance
Implementation Method 4
through the patterning of metal and dielectric layers to tune inductance and capacitance
Data Source
Figure 1A
Figure 1B
Figure 2A~2B
AI summary
Radio frequency integrated device packages having bump and/or ball launch structures are disclosed herein. The bump launch structures can comprise patterned metallic and insulating material that substantially matches the impedance of a radio frequency integrated device die. The ball launch structures can comprise patterned metallic and insulating material that substantially matches the impedance of a system board.