Optical Through Silicon Via Signal Distribution
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Solution Overview
Problem
Conventional signal distribution methods in integrated circuits, such as clock tree methodologies, consume significant power and slow down signal propagation, as they rely on multiple stages of buffers and delay elements to ensure proper timing.
Innovation Solution
The use of optical through silicon vias (TSVs) for distributing signals, where optical signals are transmitted through the silicon substrate using a photo detector and a light generating source, allowing for faster and more power-efficient signal distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional clock tree methodology is used for signal distribution, then timing control is improved, but power consumption increases significantly
Solution Approach 1:
The patent replaces the conventional electrical clock tree distribution system with an optical signal distribution system. Light generating sources convert electrical clock signals to optical signals that propagate through optical waveguides to photo detectors, which convert them back to electrical signals. This optical substitution eliminates the need for multiple electrical buffer stages, dramatically reducing power consumption while maintaining timing control through the optical path.
2Manufacturing precision
If multiple stages of buffers and delay elements are used in clock trees, then timing accuracy is improved, but signal propagation speed decreases
Solution Approach 1:
The patent substitutes electrical signal propagation through multiple buffer stages with optical signal propagation through waveguides. Optical signals travel at the speed of light in the medium, which is faster than electrical signals through multiple buffered stages. Timing accuracy is maintained through precise control of the optical path length and using synchronized light generating sources across different clock domains.
3Speed
If optical through silicon via is used for signal distribution, then signal propagation speed is improved, but device complexity increases
Solution Approach 1:
The patent integrates multiple functions into unified components: light generating sources serve both as signal sources and timing references, optical waveguides provide both signal transmission and isolation between clock domains, and photo detectors perform both signal detection and clock synchronization. This multi-functionality reduces the number of discrete components needed, offsetting the added complexity of the optical infrastructure with functional consolidation.
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 approach enables faster signal distribution with reduced power dissipation compared to traditional methods, effectively addressing the power and speed limitations of conventional signal distribution techniques.
Implementation Method 1
A light generating source optically coupled to a second side of the optical through silicon via is provided
Implementation Method 2
The photo detector is configured to receive a light, generated by the light generating source, propagating through the optical through silicon via
Data Source
AI summary
An optical through silicon via is formed in a silicon substrate of an integrated circuit. A photo detector is formed within the integrated circuit and is optically coupled to a first side of the optical through silicon via. A light generating source optically coupled to a second side of the optical through silicon via is provided. The photo detector is configured to receive a light, generated by the light generating source, propagating through the optical through silicon via. The light, generated by the light generating source, is controlled by a signal generated by a signal generating source.