Symmetric Ground Paths for Controlled-Impedance Out-of-Substrate Packages
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Solution Overview
Problem
Conventional out-of-substrate package structures face limitations in high-speed signal conversion due to impedance mismatch issues, leading to inefficient energy transfer and signal integrity degradation when mounting electrical devices on electrical substrates.
Innovation Solution
The implementation of controlled-impedance out-of-substrate package structures with ground paths arranged symmetrically with respect to the electrical device, allowing electric field lines to terminate at the ground paths and enabling better impedance matching with the electrical substrate, thus facilitating faster and more efficient signal conversion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional lead frame structures are used to mount electrical devices on electrical substrates, then ease of manufacture is improved, but impedance matching deteriorates leading to signal integrity degradation at high speeds
Solution Approach 1:
The patent changes the geometric parameters of the ground paths, specifically arranging them symmetrically with respect to the electrical device and optimizing their spacing and configuration. This parameter optimization enables controlled impedance matching (e.g., 50 ohms) while maintaining manufacturability through standard PCB fabrication processes
Solution Approach 2:
The patent employs asymmetric positioning of ground paths relative to the electrical device, with ground paths arranged symmetrically with respect to a geometric plane intersecting the device. This controlled asymmetry in layout creates symmetric electric field termination patterns that achieve impedance matching
2Productivity
If signal speed is increased to meet network demand, then productivity is improved, but impedance mismatch effects worsen causing higher signal reflections
Solution Approach 1:
The patent optimizes geometric parameters of the ground path configuration including spacing, width, and symmetric arrangement around the electrical device. These parameter changes create controlled impedance pathways that maintain signal integrity at high speeds by preventing reflections and energy loss
3Reliability
If ground paths are arranged to achieve impedance matching, then signal integrity is improved, but device complexity increases
Solution Approach 1:
The patent applies local quality by arranging ground paths with specific geometric characteristics only in the immediate vicinity of the electrical device where impedance control is most critical. The ground paths are positioned symmetrically near the device terminals to control electric field termination, while requiring no complexity changes elsewhere in the system
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 allows for higher signal speeds and improved signal integrity by effectively matching impedance, reducing signal reflections and enhancing energy transfer between the electrical device and the substrate.
Implementation Method 1
electric field lines generated by current flowing into the electrical device tend to terminate at the return or ground paths allowing for impedance to be more easily controlled
Data Source
AI summary
Controlled-impedance out-of-substrate package structures employing electrical devices and related assemblies, components, and methods are disclosed. An out-of-substrate package structure may be used to electrically couple an electrical device to an electrical substrate, for example a printed circuit board. The out-of-substrate package structure may be electrically coupled to the electrical substrate. Ground paths of the out-of-substrate package structure may be arranged proximate to the electrical device and arranged symmetric with respect to at least one geometric plane intersecting the electrical device. In this regard, electric field lines generated by current flowing into the electrical device tend to terminate at the return or ground paths allowing for impedance to be more easily controlled. Accordingly, the out-of-substrate package structure may be impedance matched in a better way with respect to power provided from the electrical substrate enabling faster electrical device speeds.