Mesh Power Supply Wiring with Boundary Slits for Crosstalk Reduction
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Solution Overview
Problem
Crosstalk occurs when power supply wires are shared between lanes in optical modules, deteriorating signal transmission quality, and existing solutions either increase the number of terminals or fail to adequately suppress crosstalk.
Innovation Solution
A mesh-shaped power supply wiring network with slits is implemented on an electrical chip, where the slits separate wires at the boundary between lanes, reducing crosstalk by isolating power supply voltage fluctuations between lanes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If power supply wires are shared between lanes, then the number of terminals is reduced, but crosstalk occurs and signal transmission quality deteriorates
Solution Approach 1:
The power supply wiring network is segmented by introducing slits that divide the continuous mesh structure into isolated regions corresponding to different lanes. This segmentation prevents crosstalk between lanes while maintaining the reduced terminal count benefit of shared power supply wires.
Solution Approach 2:
The mesh-shaped power supply wiring network provides different local qualities: continuous mesh structure within each lane for low resistance and uniform power distribution, and separated mesh structure at lane boundaries for crosstalk suppression. This local differentiation resolves the contradiction between shared wiring and crosstalk prevention.
2Device complexity
If power supply wires are shared between lanes, then device complexity is reduced, but crosstalk occurs and signal transmission quality deteriorates
Solution Approach 1:
The power supply wiring network is segmented by introducing slits that divide the continuous mesh structure into isolated regions corresponding to different lanes. This segmentation prevents crosstalk between lanes while maintaining the reduced terminal count benefit of shared power supply wires.
Solution Approach 2:
The mesh-shaped power supply wiring network serves multiple functions simultaneously: it provides power distribution across the chip, maintains low resistance through continuous mesh structures within lanes, and suppresses crosstalk through separated mesh structures at lane boundaries. This multi-functionality reduces device complexity while preventing crosstalk.
3Object-affected harmful factors
If slits are introduced to separate power supply wires at lane boundaries, then crosstalk is suppressed, but resistance value increases which may cause voltage drop
Solution Approach 1:
The mesh parameter (wire spacing and pattern) is optimized to balance resistance and crosstalk suppression. By carefully designing the mesh structure, the patent achieves effective lane isolation while minimizing resistance increase and preventing voltage drop issues.
Solution Approach 2:
The slits are introduced partially - only at lane boundaries where crosstalk occurs - rather than completely separating all power supply wires. This partial separation achieves crosstalk suppression while maintaining sufficient electrical connectivity to prevent voltage drop.
Data Source
AI summary
An electrical chip includes a plurality of electrical signal processing circuits arranged side by side on a chip board, the electrical signal processing circuits that processes electrical signals transmitted to each of a plurality of lanes for each lane; and a power supply wiring network provided in an area overlapping with each of the plurality of electrical signal processing circuits and including wires formed into a mesh shape for supplying power to each of the plurality of electrical signal processing circuits, wherein the power supply wiring network includes a slit obtained by separating a part of the wires in each area corresponding to a boundary between the lanes.