Multi-conductor Interconnect with Integrated Shielding
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Solution Overview
Problem
Conventional wire bonding techniques in microelectronic devices result in suboptimal shielding and impedance control, leading to increased device height, assembly time, and limitations in high-speed interconnects due to independent wire structures and non-ideal current return paths.
Innovation Solution
A multi-conductor interconnect structure with integrated shielding, where signal conductors and shielding conductors are interleaved and electrically isolated by a dielectric structure, along with a reference shield layer, to provide effective electromagnetic interference protection and improved impedance control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If wire bonding techniques are used with independent wire structures and interspersed shielding wires, then electromagnetic shielding is provided, but the shielding effectiveness is suboptimal and impedance control is poor
Solution Approach 1:
The patent merges signal conductors and shielding conductors into a single integrated multi-conductor interconnect structure. The shielding conductors are interleaved between signal conductors within the same flexible circuit board, creating a unified structure that provides both signal transmission and electromagnetic shielding functions with ideal current return paths, resolving the impedance control issues of separate wire bonding structures
Solution Approach 2:
The patent introduces a reference shield layer and interconnected shielding conductors as intermediary structures between signal conductors. These shielding elements serve as mediators that provide controlled impedance by establishing defined current return paths, thereby improving electromagnetic interference protection while maintaining reliable impedance control
2Ease of operation
If wire bonding with nail heads and loop clearance is used, then electrical connections are established, but the vertical height of the device increases
Solution Approach 1:
The patent extracts and eliminates the nail head structure and loop clearance requirements from traditional wire bonding. By transitioning to conductors mounted on a flexible circuit board, the design removes the need for vertical loop formations, thereby reducing the overall vertical height of the device while maintaining electrical connection functionality
Solution Approach 2:
The patent transitions from three-dimensional wire bonding loops extending vertically to a two-dimensional planar conductor layout on a flexible circuit board. This dimensional change allows electrical connections to be established without requiring vertical loop clearance, significantly reducing device height
3Ease of operation
If individual wire bonding is performed for each interconnection, then electrical connections are made, but assembly throughput time increases substantially
Solution Approach 1:
The patent merges multiple individual wire bonding operations into a single integrated flexible circuit board assembly process. Multiple conductors are pre-configured and interconnected on the flexible circuit board before attachment, allowing simultaneous establishment of multiple electrical connections rather than sequential wire bonding, thereby dramatically improving assembly throughput
Solution Approach 2:
The patent performs preliminary configuration of conductors and interconnections on the flexible circuit board before final assembly. The conductors are pre-positioned, interconnected, and shielded in advance, eliminating the need for time-consuming individual wire bonding operations during device assembly and significantly increasing productivity
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
The solution enhances electromagnetic interference protection, reduces device height, and increases assembly efficiency by enabling high-speed interconnects while maintaining optimal impedance control, thus improving the performance and scalability of microelectronic devices.
Implementation Method 1
a dielectric structure extending between the first and second groups of multiple conductors and electrically isolating the first group of multiple conductors from the second group of multiple conductors
Data Source
AI summary
A multi-conductor interconnect for a microelectronic device incorporates multiple conductors and integrated shielding for the conductors. The multi-conductor interconnect includes first and second groups of conductors interleaved with one another within a dielectric structure. One of the groups of conductors may be coupled to a reference voltage node to provide shielding for the other group of conductors. The multi-conductor interconnect may further include a shield layer extending over some portion, or all, of the conductors of the first and second groups.