Backside Conductive Segment Layout for IC Signal Detection
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Solution Overview
Problem
Backside conductive lines in integrated circuits can interfere with testing and analysis processes such as laser-based failure analysis and electron beam inspection, limiting the detection of signals from the substrate.
Innovation Solution
The integration of backside metal layers is designed to cover only select areas of the substrate, leaving other areas exposed for testing, with direct metal-to-metal contacts between layers to reduce height and facilitate detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If backside conductive lines are added to transmit power signals, then power delivery is improved, but detection capability during testing and analysis deteriorates
Solution Approach 1:
The backside conductive layer is segmented into multiple discrete conductive segments rather than continuous lines. Each segment is strategically positioned to provide power transmission only where needed, leaving gaps that allow testing and analysis signals to pass through to the substrate.
Solution Approach 2:
The conductive segments are selectively placed in specific locations on the backside of the substrate, providing power transmission in those local areas while leaving other areas open for testing and analysis. This creates different functional zones within the same layer.
2Reliability
If backside metal layers are added to cover select areas, then electrical connectivity is improved, but exposed area for testing decreases
Solution Approach 1:
The metal layers are divided into discrete segments rather than continuous coverage. This segmentation allows the structure to provide electrical connectivity in specific areas while maintaining exposed regions for testing and analysis.
Solution Approach 2:
Instead of providing complete coverage with backside metal layers, the patent uses partial coverage with segments positioned only where electrical connectivity is required. This partial action maintains the necessary functionality while preserving testing access.
3Length of stationary object
If direct metal-to-metal contacts are used to reduce height, then device profile is improved, but manufacturing complexity increases
Solution Approach 1:
The patent merges adjacent metal segments from different layers to form direct metal-to-metal contacts, eliminating the need for intermediate dielectric layers and via structures. This combining approach reduces overall device height while the regular patterning keeps manufacturing manageable.
Data Source
AI summary
An integrated circuit includes multiple backside conductive layers disposed over a backside of a substrate. The multiple backside conductive layers each includes conductive segments. The conductive segments in at least one of the backside conductive layers are configured to transmit one or more power signals. The conductive segments of the multiple backside conductive layers cover select areas of the backside of the substrate, thereby leaving other areas of the backside of the substrate exposed.