Optoelectronic IC Interconnect Layout for Capacitive Isolation
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Solution Overview
Problem
There is a challenge in integrating electrical connections between optical and electronic circuit components while preventing coupling capacitance with a conductive layer in microelectronics, as existing methods fail to effectively isolate these components.
Innovation Solution
The solution involves a conductive layer extending between optical and electronic circuit components with electrical insulation rings formed from transformed portions of the conductive layer, which are dielectric, to prevent capacitive coupling, and electrical connections are made through holes in dielectric layers to maintain insulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conductive layer is placed between optical and electronic circuit components to prevent capacitive coupling, then isolation between components is improved, but the conductive layer must be positioned at a distance from electrical connections which increases device complexity and manufacturing difficulty
Solution Approach 1:
The conductive layer is positioned close to electrical connections in regions where capacitive coupling is not a concern (under electronic circuit components), while maintaining distance only in critical regions (between optical and electronic components). This localized differentiation resolves the contradiction by applying spacing requirements only where necessary for isolation.
Solution Approach 2:
A dielectric layer is introduced as an intermediary between the conductive layer and electrical connections in critical regions. This mediator allows the conductive layer to be positioned close to connections while still preventing capacitive coupling, thus reducing device complexity while maintaining isolation reliability.
2Reliability
If the conductive layer is extended close to electrical connections to improve isolation, then capacitive coupling is reduced, but manufacturing precision requirements increase due to the need for precise positioning
Solution Approach 1:
The dielectric layer serves as a buffer between the conductive layer and electrical connections, allowing the conductive layer to be positioned close to connections without direct capacitive coupling. This intermediary reduces the stringency of manufacturing precision requirements while maintaining effective isolation.
Solution Approach 2:
The space between optical and electronic components is segmented into critical and non-critical regions. In critical regions, the conductive layer is positioned close to connections with the help of dielectric intermediaries, while in non-critical regions, standard positioning suffices. This segmentation allows relaxed manufacturing precision overall while achieving effective isolation where needed.
3Reliability
If electrical insulation rings are formed around electrical connections to prevent capacitive coupling, then isolation is improved, but the number of additional components and fabrication steps increases device complexity
Solution Approach 1:
The electrical insulation rings are merged with the conductive layer, forming a single integrated structure. The conductive layer itself is patterned to include insulating sections that serve as the insulation rings, eliminating the need for separate insulation ring components and reducing fabrication steps.
Solution Approach 2:
The conductive layer performs multiple functions: it provides grounding/shielding in most regions and provides electrical insulation in critical regions through its patterned insulating sections. This multi-functionality eliminates the need for separate insulation rings, reducing device complexity while maintaining isolation effectiveness.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration effectively reduces coupling capacitance by ensuring the conductive layer is distant from electrical connections and insulation rings are dielectric, enhancing the isolation between optical and electronic circuit components.
Implementation Method 1
The electrical insulation rings can be made of oxidized doped polysilicon
Data Source
AI summary
A first circuit structure of an electronic IC device includes comprises light-sensitive optical circuit components. A second circuit structure of the electronic IC device includes an electronic circuit component and an electrically-conductive layer extending between and at a distance from the optical circuit components and the electronic circuit component. Electrical connections link the optical circuit components and the electronic circuit component. These electrical connections are formed in holes which pass through dielectric layers and the intermediate conductive layer. Electrical insulation rings between the electrical connections and the conductive layer are provided which surround the electrical connections and have a thickness equal to a thickness of the conductive layer.