Backside Metal Routing Layout for Flexible IC Signal Transmission
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing semiconductor integrated circuits face challenges in optimizing metal track arrangement for higher area utilization and efficient signal transmission, particularly in the backside metal routing, which limits flexibility and resource optimization.
Innovation Solution
The integration of inner metal layers in the backside metal routing for transmitting logic signals, alongside the use of conductive segments and vias to enhance signal transmission and optimize metal resources, allowing for more flexible metal routing configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional metal routing is used on the backside of the integrated circuit, then the structure is simple, but the area utilization and signal transmission flexibility are limited
Solution Approach 1:
The patent utilizes the backside of the substrate as an additional dimension for metal routing, creating inner metal layers that extend into the backside region. This allows signal transmission paths to wrap around the substrate edges and connect frontside components, significantly increasing routing flexibility without adding lateral complexity to the frontside layout.
Solution Approach 2:
The metal routing is divided into frontside metal layers and backside inner metal layers, with each serving distinct functions. The inner metal layers on the backside are segmented into multiple tracks that can be independently routed and connected to different frontside components, allowing flexible resource allocation and signal distribution.
2Productivity
If more metal tracks are added to improve area utilization, then the resource optimization improves, but the device complexity increases
Solution Approach 1:
The inner metal layers on the backside serve multiple functions: they act as signal transmission paths, provide additional routing resources for frontside components, and can be configured to connect various types of devices (logic devices, memory devices, etc.). This multi-functionality increases effective resource utilization without proportionally increasing structural complexity.
3Adaptability or versatility
If inner metal layers are integrated for logic signal transmission, then signal transmission flexibility improves, but the manufacturing complexity increases
Solution Approach 1:
The substrate is prepared with predefined edge regions and sacrificial layers before metal deposition. These preliminary structures guide the formation of inner metal layers, ensuring they are positioned correctly on the backside and maintain proper spacing from frontside components. This preliminary preparation simplifies subsequent manufacturing steps despite the added complexity of backside routing.
Data Source
AI summary
An integrated circuit structure is provided, including a gate, a first conductive line and a pair of second conductive lines, and a first feed-through via. The gate is disposed on a front side of the integrated circuit structure and extends in a first direction on a first side of a dielectric layer. The first conductive line and a pair of second conductive lines are disposed on a second side, opposite of the first side, of the dielectric layer and on a back side, opposite of the front side, of the integrated circuit structure. The first conductive line is interposed between the pair of second conductive lines in a layout view. The first feed-through via extends through the dielectric layer in a second direction different from the first direction. The first feed-through via couples the gate to the first conductive line.