Coaxial SLI Socket Architecture for 224 Gb/s Signal Integrity
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Solution Overview
Problem
Current land grid array (LGA)/ball grid array (BGA) socket designs introduce impedance discontinuities and excessive crosstalk, limiting data transfer rates and scalability due to impractical loading forces and inadequate shielding, especially as pin counts increase with rising IO demands.
Innovation Solution
The implementation of sockets with a coaxial architecture featuring a conductive shell surrounding the pins, which are optimized in design and materials to minimize impedance discontinuities and cross-talk, and are grounded for improved return path optimization, allowing for reduced pin counts and enhanced scalability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If LGA/BGA socket contact design is used, then mechanical connection is achieved, but impedance discontinuities and excessive crosstalk are introduced
Solution Approach 1:
The patent removes the traditional solder ball from the connection interface, extracting the source of impedance discontinuities. By eliminating the spherical solder ball and replacing it with a flat contact design, the patent eliminates the geometric discontinuity that causes signal reflections and impedance mismatches, thereby reducing harmful electrical effects while maintaining mechanical connection.
Solution Approach 2:
The patent implements a nested structure where an outer shield encloses the inner signal pin. This concentric arrangement creates a coaxial geometry that provides electromagnetic shielding, containing the signal field within the outer conductor and preventing crosstalk with adjacent signals. The nested configuration also provides a controlled impedance transmission line structure.
2Productivity
If pin count is increased to meet IO demand, then signal transmission capacity is improved, but loading force becomes impractical and scalability is limited
Solution Approach 1:
The patent combines multiple functions into a single integrated contact structure. The pin serves simultaneously as the signal conductor, the mechanical load-bearing element, and the impedance-controlled transmission line. This integration eliminates the need for separate solder balls and reduces the number of discrete components, thereby reducing total pin count while maintaining signal transmission capacity through improved electrical characteristics.
Solution Approach 2:
The patent changes the geometric parameters of the contact structure from a spherical solder ball to a cylindrical pin with specific dimensions. By optimizing the pin diameter, length, and wall thickness, the patent achieves controlled impedance (e.g., 50 ohms) that maintains signal integrity at high data rates. This parameter optimization allows reduced pin count while sustaining high-speed data transfer capability.
3Object-affected harmful factors
If conductive shield is provided along socket housing surfaces, then some crosstalk protection is achieved, but significant portions of pins remain unshielded
Solution Approach 1:
The patent transitions from a two-dimensional shield planar surface to a three-dimensional coaxial cylindrical shield that completely surrounds the signal pin. This dimensional change creates a closed electromagnetic enclosure that provides 360-degree shielding around the signal conductor, effectively containing the electromagnetic field and providing comprehensive protection against crosstalk from all directions, not just from adjacent pins.
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 solution achieves significant reductions in impedance discontinuities and cross-talk, enabling data transfer rates of up to 224 Gb/s and allows for a 30-50% reduction in pin count compared to existing solutions, addressing scalability challenges and improving overall electrical performance.
Implementation Method 1
a spring around the first portion of the pin, wherein a first end of the spring presses against the bottom surface, and wherein a second end of the spring presses against the second portion of the pin
Implementation Method 2
The implementation of sockets with a coaxial architecture featuring a conductive shell surrounding the pins, which are optimized in design and materials to minimize impedance discontinuities and cross-talk, and are grounded for improved return path optimization
Implementation Method 3
a coaxial architecture featuring a conductive shell surrounding the pins, which are optimized in design and materials to minimize impedance discontinuities and cross-talk
Data Source
AI summary
In an embodiment, a socket comprises a housing, where the housing is a dielectric material. In an embodiment, a shell passes through a thickness of the, where the shell is conductive. The socket may further comprise a plug within the shell, where the plug is a dielectric material, and where the plug has a bottom surface. In an embodiment, a pin passes through the thickness of the housing within an inner diameter of the shell, where the pin has a first portion with a first diameter and a second portion with a second diameter, and where the pin is conductive. In an embodiment, the socket further comprises a spring around the first portion of the pin, where a first end of the spring presses against the bottom surface, and where a second end of the spring presses against the second portion of the pin.