IC Package Assembly With Oblong Pads for Impedance Matching
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Solution Overview
Problem
Impedance discontinuities between components in integrated circuits (ICs) lead to signal loss and reduced signal integrity, limiting the effective operation of ICs, especially during high-data-rate transmissions.
Innovation Solution
The use of oblong pads electrically coupling core vias to packages in ICs, along with a dielectric material in the core region, helps to match the impedance of the pads and core vias, reducing resonance and reflection and improving signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional circular pads are used to electrically couple core vias to packages, then manufacturing is simple, but impedance discontinuities cause signal loss and reduced signal integrity
Solution Approach 1:
The pad shape is changed from conventional circular to oblong configuration. This parameter change in geometry allows the pad's impedance to be better matched to the core via impedance, reducing impedance discontinuities and improving signal integrity during high-data-rate transmissions.
Solution Approach 2:
The oblong pad shape is specifically designed with different dimensions in different directions (longitudinal vs transverse). The longitudinal dimension is optimized for impedance matching with the core via, while the transverse dimension provides adequate spacing. This local quality differentiation enables precise impedance control at the critical via-pad interface.
2Reliability
If impedance matching is optimized for high-data-rate transmissions, then signal integrity improves, but device complexity increases due to specialized pad geometry and material requirements
Solution Approach 1:
The dielectric material's permittivity parameter is specifically selected and controlled to achieve impedance matching between the oblong pad and core via. By adjusting this material parameter, the complex interaction between pad geometry and electrical signal is optimized, reducing resonance and reflection effects without requiring complex additional structures.
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 configuration reduces impedance discontinuities, leading to improved signal integrity and reduced signal loss, thereby enhancing the operational effectiveness of ICs, especially at higher data rates.
Implementation Method 1
the pad includes an oblong shape... helps to match the impedance of the pads and core vias, reducing resonance and reflection
Implementation Method 2
along with a dielectric material in the core region, helps to match the impedance of the pads and core vias, reducing resonance and reflection
Data Source
AI summary
In some embodiments, an integrated circuit (IC) includes multiple packages that are separate from one another. Each package includes a pad, and a core via is electrically coupled to the pads of the separate packages to electrically couple the packages to one another. At least one of the pads includes an oblong shape to match its impedance with the impedance of the core via.