Edge Gate Contact Layout for IC Routing and Interference Reduction
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Solution Overview
Problem
Routability issues in integrated circuits (ICs) arise due to limitations in interconnect design, leading to signal propagation delays and interference, particularly when gate contacts are confined to shallow trench isolation regions, which restricts routing options and increases electromagnetic interference.
Innovation Solution
Positioning gate contacts at the edge of the gate channel, allowing for efficient utilization of metal tracks and integration with the backside power delivery network, reducing signal interference and optimizing signal routing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If gate contacts are confined to shallow trench isolation regions, then manufacturing process is simplified, but routing options are restricted and electromagnetic interference increases
Solution Approach 1:
The gate contact structure transitions from a planar configuration confined to the shallow trench isolation region to a three-dimensional structure that extends vertically above the gate channel. This dimensional change allows the gate contact to be positioned in the vertical dimension, creating additional routing pathways and reducing electromagnetic interference while maintaining manufacturing simplicity through standard deposition and etching processes.
2Ease of manufacture
If gate contacts are confined to shallow trench isolation regions, then manufacturing process is simplified, but signal propagation delays increase
Solution Approach 1:
By extending the gate contact vertically above the gate channel, the signal path length is reduced. The three-dimensional positioning allows direct vertical connection to metal interconnect layers, eliminating the need for longer lateral routing paths through the shallow trench isolation region, thereby reducing signal propagation delays.
3Productivity
If gate contacts are positioned at the edge of the gate channel, then routing efficiency is improved, but device complexity increases
Solution Approach 1:
The gate contact structure is formed as part of the standard transistor fabrication sequence, with the vertical extension created during the same deposition and patterning steps used for forming the gate electrode. This preliminary action integrates the complex three-dimensional structure into the existing manufacturing flow without requiring additional processing steps, thereby maintaining ease of manufacture while achieving improved routing efficiency.
Data Source
AI summary
A semiconductor device includes a gate contact over a first gate channel of two adjacent gate channels, and a first dielectric layer encapsulating a lower portion of a second dielectric layer and covering a first side of the second dielectric layer. The first dielectric layer is extended vertically between two adjacent gate channels, and the gate contact is connected to an upper portion of the first side of the second dielectric layer.