Programmable Vertical Interconnects for Reconfigurable 3D Circuit Routing
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Solution Overview
Problem
Conventional microelectronic devices require constant power to maintain circuit elements and involve costly and time-consuming processes for modifying circuit designs, as new photomasks are needed to add or remove connections between metal lines, limiting flexibility and efficiency in circuit modifications.
Innovation Solution
Incorporating programmable vertical interconnects made of materials with modifiable resistivity, allowing connections between metal lines to be switched between conductive and non-conductive states after microfabrication, enabling 3D switching matrices and reducing the need for constant photomask modifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional photomask modifications are used to add or remove circuit connections, then circuit design changes can be made, but the process becomes expensive and time-consuming
Solution Approach 1:
The patent applies preliminary action by pre-forming all possible vertical interconnect structures during the standard microfabrication process, including both conductive and non-conductive vias. The programmable material is deposited in all via locations before final patterning, enabling post-fabrication reconfiguration without requiring additional mask steps. This preliminary preparation of all potential connection paths allows rapid circuit modification by simply programming the desired connections rather than physically modifying the structure.
Solution Approach 2:
The patent implements dynamics by introducing programmable vertical interconnects that can dynamically change their conductive state after fabrication. The via structures are not fixed in their connectivity state but can be programmed to become conductive or remain non-conductive based on circuit requirements. This dynamic reconfigurability allows the circuit topology to be changed post-fabrication without physical modification, resolving the contradiction between design flexibility and modification time.
2Adaptability or versatility
If new photomasks are created to modify circuit connections, then circuit functionality can be changed, but manufacturing cost increases
Solution Approach 1:
The patent applies preliminary action by pre-forming all possible vertical interconnect structures during the standard microfabrication process, including both conductive and non-conductive vias. The programmable material is deposited in all via locations before final patterning, enabling post-fabrication reconfiguration without requiring additional mask steps. This preliminary preparation of all potential connection paths allows rapid circuit modification by simply programming the desired connections rather than physically modifying the structure.
Solution Approach 2:
The patent replaces the mechanical/physical system of photomask-based circuit modification with an electrical/programmatic system. Instead of using physical masks to define connections, the patent uses programmable materials that can be electrically or thermally stimulated to change their conductive state. This substitution eliminates the need for expensive custom mask fabrication and alignment processes, reducing manufacturing costs while maintaining reconfigurability.
3Adaptability or versatility
If circuit elements are turned on or off to enable data paths, then circuit functionality is achieved, but constant power is required
Solution Approach 1:
The patent applies preliminary action by pre-forming all possible vertical interconnect structures during the standard microfabrication process, including both conductive and non-conductive vias. The programmable material is deposited in all via locations before final patterning, enabling post-fabrication reconfiguration without requiring additional mask steps. This preliminary preparation of all potential connection paths allows rapid circuit modification by simply programming the desired connections rather than physically modifying the structure.
Solution Approach 2:
The patent changes the resistivity parameter of the programmable vertical interconnects to control circuit connectivity. By programming the programmable materials to transition between high-resistance (non-conductive) and low-resistance (conductive) states, the circuit can be reconfigured without constant power. The parameter change in resistivity provides a power-efficient mechanism for enabling or disabling circuit paths, as the programmed state is maintained without requiring continuous energy input.
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 solution allows for indefinite turning on or off of circuit elements without constant power, reduces operational power requirements, and enhances the flexibility and speed of circuit design changes by eliminating the need for active circuit elements to maintain new circuit blocks.
Implementation Method 1
The programmable vertical interconnect is formed based on a programmable material having a modifiable resistivity in that the programmable vertical interconnect can change between being conductive and being non-conductive
Data Source
AI summary
A semiconductor device includes a first level having a plurality of transistor devices, and a first wiring level positioned over the first level. The first wiring level includes a plurality of conductive lines extending parallel to the first level, a plurality of conductive vertical interconnects extending perpendicular to the first level, and one or more programmable vertical interconnects that extend perpendicular to the first level and include a programmable material having a modifiable resistivity in that the one or more programmable vertical interconnects change between being conductive and being non-conductive according to a current pattern.