Multi-Wire Bonding via Stud Bumps for IC Signal Integrity
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Solution Overview
Problem
The increasing complexity and miniaturization of electronic devices constrain the packaging of integrated circuits, limiting the area available for wire bonds and affecting signal integrity and device footprint.
Innovation Solution
The technique involves bonding multiple wires to a single bond pad using stud bumps, reducing wire length by applying a stud bump to the pad and successively bonding each wire, with an additional stud bump providing connection security, thereby enhancing signal integrity and reducing the footprint.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single wire bond is used per bond pad, then the wiring structure is simple, but the wire length increases and signal integrity deteriorates
Solution Approach 1:
The patent divides the single wire bond connection into multiple segmented wire bonds (first wire bond, second wire bond, third wire bond) that connect sequentially between adjacent bond pads. This segmentation reduces the length of each individual wire bond path, improving signal integrity while maintaining a manageable wiring structure through systematic segmentation of the electrical connection path.
2Area of stationary object
If multiple wire bonds are used per bond area, then the footprint is reduced, but the bonding process becomes more complex
Solution Approach 1:
The patent transitions from a single-planar wire bond approach to a multi-dimensional bonding structure by introducing wire bonds at different spatial levels and orientations. The first, second, and third wire bonds are arranged to connect adjacent bond pads through a three-dimensional path, reducing the horizontal footprint while the systematic arrangement maintains manufacturing feasibility through structured spatial organization.
3Reliability
If wire length is reduced, then signal integrity improves, but the number of wire bonds increases
Solution Approach 1:
The patent combines multiple wire bonds (first, second, and third wire bonds) to form an integrated wiring structure that collectively achieves signal integrity improvement. By merging these multiple bonding paths into a coordinated system connecting adjacent bond pads, the structure achieves reduced effective signal path length and improved reliability while the combined wiring arrangement maintains manageable complexity through systematic integration.
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 reduces the length of connecting wires, improving signal integrity and minimizing the integrated circuit package size, while providing enhanced connection security.
Implementation Method 1
bonding multiple wires to a single bond pad using stud bumps
Implementation Method 2
successively bonding each wire to the stud bump
Data Source
AI summary
Wire bonds are formed at an integrated circuit device so that multiple wires are bonded to a single bond pad. In a particular embodiment, the multiple wires are bonded by first applying a stud bump to the pad and successively bonding each of the wires to the stud bump. Another stud bump can be placed over the bonded wires to provide additional connection security.