Multi-Beam Interposer Contacts for Shorter Signal Paths
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Solution Overview
Problem
Existing interposers face challenges in providing high signal integrity and reliable connections between components with offset pad arrays on a printed circuit board and a semiconductor device, due to constraints in positioning signal and ground contacts.
Innovation Solution
The use of multi-beam contacts with an outer beam and an inner beam, designed as a unitary piece, where the inner beam is shorter than the outer beam, providing a shorter electrical path and adjustable spring constant, along with lossy or conductive structures to attenuate resonances, ensuring reliable and high-density connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single beam contact is used to connect offset pad arrays, then the contact can provide mechanical compliance, but the electrical path length is increased and signal integrity deteriorates
Solution Approach 1:
The contact is divided into multiple beam segments (first beam, second beam, third beam) arranged in series. Each beam segment contributes a portion of the total deflection, allowing the electrical path to follow a more direct route while maintaining compliance. The segmentation enables the contact to achieve both short electrical path length and mechanical compliance through distributed flexibility.
2Reliability
If multiple beams are used to reduce electrical path length, then signal integrity improves, but the contact structure becomes more complex
Solution Approach 1:
Multiple beam segments are merged into a unitary contact structure formed from a single piece of conductive material. This integration eliminates the need for separate components, fasteners, or alignment mechanisms that would increase complexity. The unified structure achieves multiple functions (compliance, short electrical path, structural support) through a single manufactured element.
3Reliability
If the contact structure is made more compliant to accommodate offset pads, then mechanical reliability improves, but resonant effects increase and signal integrity worsens
Solution Approach 1:
Different regions of the contact structure have different mechanical properties optimized for their specific functions. The beam segments have varying dimensions and material properties to provide appropriate compliance in certain areas while maintaining stiffness in other areas to suppress resonances. This local differentiation allows the contact to be compliant where needed and rigid where required to minimize harmful resonant effects.
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 enhances signal integrity by reducing impedance and resonant effects, allowing for higher data rates and improved thermal performance while maintaining mechanical reliability.
Implementation Method 1
The first beam and the second beam are in a plane parallel to the first direction with the second contact surface within the working range of the first beam such that the first beam is adapted to contact the second beam upon deflection of the first beam
Implementation Method 2
along with lossy or conductive structures to attenuate resonances
Data Source
AI summary
An interposer configured for connecting offset arrays of signal pads on parallel surfaces. Contacts of the interposer have mating portions with multiple beams. One of the beams makes contact with a pad on a first of the surfaces and is deflected when the surfaces are pressed together with the interposer between them. A second of the beams is positioned so that the first beam presses into that second beam as the first beam deflects. The second beam may contact a central location on the first beam. An electrical path through the contact from a pad on the first surface to a pad on the second surface may be shorter when the first beam is pressed into the second beam than through the first beam alone. A shorter path may improve signal integrity. Moreover, the spring force of the contact may be set by the second beam.