Offset Bond Pad Layout for Dense Microelectronic Stacking
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Solution Overview
Problem
Conventional microelectronic devices face challenges in deploying multiple devices in a single package due to limitations in signal quality, power delivery, and the risk of shorting connections, particularly with wire bonds crossing paths and interacting with other structures.
Innovation Solution
The configuration of bond pads on opposite sides of microelectronic devices, offset from each other, allows for more direct and segregated connections to substrate lands, reducing the risk of shorts and improving signal quality by facilitating perpendicular routing of power and data signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wire bonds are used to connect microelectronic devices to substrate, then electrical connections are established, but the risk of shorting connections increases due to wire bonds crossing paths and interacting with other structures
Solution Approach 1:
The patent transitions from conventional single-sided bond pad arrangements to multi-sided bond pad configurations, utilizing multiple dimensions (sides) of the microelectronic device. This dimensional expansion allows wire bonds to be routed through different spatial planes, preventing crossing paths and reducing shorting risks while maintaining connection functionality.
Solution Approach 2:
The patent divides the bond pad connections into multiple separate groups located on different sides of the device, with each group serving specific functional purposes (power, data, control). This segmentation isolates different signal types and reduces the probability of unintended interactions or shorts between unrelated connections.
2Productivity
If multiple microelectronic devices are deployed in a single package, then device density increases, but signal quality deteriorates due to interference and power delivery issues
Solution Approach 1:
The patent segments bond pads into functionally distinct groups (power bonds, data bonds, control bonds) located on different sides of the device. This segmentation allows for dedicated routing paths for each signal type, preventing interference between power and data signals even when multiple devices are densely packed in a single package.
Solution Approach 2:
The patent assigns different bond pad configurations and routing strategies to different functional regions of the device. Power bonds are routed through specific locations optimized for power delivery, while data bonds use separate paths optimized for signal integrity, allowing each region to maintain high quality despite overall high device density.
3Reliability
If bond pads are positioned on opposite sides of microelectronic devices, then direct and segregated connections are achieved, but manufacturing complexity increases
Solution Approach 1:
The patent employs standardized bond pad groups that can be replicated across multiple devices and sides. Each bond pad group follows a consistent configuration pattern, allowing the same manufacturing processes and bonding techniques to be applied universally, thereby reducing the impact of increased spatial complexity on ease of manufacture.
Data Source
AI summary
Stacks of microelectronic devices may include first bond pads located proximate to, and distributed along, a first side of a first microelectronic device. Other bond pads may be located proximate to, and distributed along, another side of the first microelectronic device perpendicular to the first side. A first pitch of the first bond pads may be greater than another pitch of the other bond pads. When the first microelectronic device is supported on a second microelectronic device, the bond pads on opposing sides of the microelectronic devices may be interposed between one another in the direction parallel to the first shortest distance between adjacent first bond pads.