Clock Distribution Circuit for 3D Die Signal Synchronization
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Solution Overview
Problem
In highly integrated semiconductor devices with three-dimensional packages, the increased signal load due to narrow interconnection lines and stacked semiconductor dies leads to synchronization issues with high-frequency clocks, resulting in inconsistent signal output.
Innovation Solution
A semiconductor circuit apparatus comprising a clock-distributing unit, an internal circuit unit, and an output-controlling unit that generates a distribution clock and selects between input and distribution clocks based on clock selection and output selection signals to synchronize or bypass internal circuit output signals, ensuring accurate output timing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of stacked semiconductor dies is increased to achieve high integration, then packaging density is improved, but signal load increases causing synchronization issues
Solution Approach 1:
The patent segments the clock distribution system into multiple independent clock trees, each serving specific semiconductor dies. This segmentation isolates signal load issues to individual trees, preventing synchronization failures across the entire system when integration density increases.
Solution Approach 2:
The patent introduces clock selection circuits and buffer circuits as intermediary elements between the clock source and internal circuits. These intermediaries manage signal load by selectively routing clock signals and providing buffering, ensuring stable synchronization even with increased stacking density.
2Productivity
If interconnection line width is decreased to increase integration, then device density is improved, but signal load increases causing timing errors
Solution Approach 1:
The patent divides the interconnection system into multiple narrow interconnection lines organized in separate clock trees. This segmentation allows each narrow line to carry dedicated clock signals without accumulating excessive load, maintaining timing precision despite reduced line widths for higher density.
Solution Approach 2:
The patent applies different clock distribution strategies to different local regions. Each clock tree is optimized for its specific region's signal load characteristics, allowing narrow interconnection lines to be efficiently managed locally while maintaining overall system timing accuracy.
3Device complexity
If clock distribution is simplified to reduce complexity, then device complexity is reduced, but synchronization accuracy deteriorates with increased stacking
Solution Approach 1:
The patent implements dynamic clock selection capability where clock selection circuits can adaptively choose between different clock trees based on signal load conditions and timing requirements. This dynamic approach maintains synchronization accuracy across stacked dies without requiring a fixed complex distribution structure.
Solution Approach 2:
The patent designs clock selection circuits that can universally handle multiple clock sources and routing options. These multi-functional circuits manage synchronization across different stacking configurations, reducing overall device complexity while maintaining reliability through flexible clock distribution management.
Data Source
AI summary
A semiconductor integrated circuit apparatus may include a clock-distributing unit, an internal circuit unit and an output-controlling unit. The clock-distributing unit may drive an input clock to output a distribution clock. The internal circuit unit may generate an internal circuit output signal in response to an input signal and the distribution clock. The output-controlling unit may select one of the input clock and the distribution clock in response to a clock selection signal and an output selection signal. The output-controlling unit may synchronize the internal circuit output signal with a clock selected between the input clock and the distribution clock or bypass the internal circuit output signal to output an output signal.