3D IC Vertical Interconnect Layout With TSV Buffer Cells
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Solution Overview
Problem
In 3D stacked integrated circuits, through-silicon vias (TSVs) face challenges in efficiently connecting multiple die layers while minimizing footprint and optimizing area utilization, particularly in heterogeneous integration scenarios where different types of devices on each layer have varying power requirements, leading to potential adverse effects like electromagnetic interference and heat degradation.
Innovation Solution
The integration of non-sensitive circuits, such as repeaters and passive components, within unused die areas of TSV cells in each die layer, which act as buffers to mitigate adverse effects and optimize TSV layout based on power requirements and IR drop considerations, allowing for varied TSV density and layout across layers to improve area usage and signal routing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If TSV density is increased to improve area utilization, then more devices can be connected, but electromagnetic interference and heat degradation worsen
Solution Approach 1:
The patent segments the TSV cell structure by introducing unused die areas that are electrically isolated from the TSVs. These segmented regions act as buffers that divide the electromagnetic fields and heat paths, allowing higher TSV density while mitigating interference and thermal effects on sensitive circuits.
Solution Approach 2:
The unused die areas serve as intermediary buffer zones between TSVs and sensitive circuits. These intermediary regions absorb and dissipate electromagnetic interference and heat, protecting sensitive devices while enabling closer TSV spacing for improved area utilization.
2Power
If TSV layout is optimized for power requirements, then power signal transmission improves, but device complexity increases
Solution Approach 1:
The patent applies local quality by creating different TSV layouts in different regions of the die based on local power requirements. High-power regions have denser TSV arrangements while low-power regions have sparser layouts, optimizing power transmission locally without requiring complex global routing.
Solution Approach 2:
The invention changes the parameter of TSV density spatially across the die, adjusting the concentration of TSVs based on local power demands. This parameter variation allows efficient power distribution while maintaining manageable layout complexity through systematic regional differentiation.
3Area of stationary object
If heterogeneous integration is implemented to reduce footprint, then system integration improves, but thermal management becomes more difficult
Solution Approach 1:
The patent segments the heterogeneous die structure by incorporating unused die areas that act as thermal buffers. These segmented regions create thermal isolation zones that prevent heat from high-power devices from affecting sensitive low-power devices, enabling compact heterogeneous integration with improved thermal management.
Data Source
AI summary
A 3D IC structure includes multiple dies, such as a top die and a bottom die. The top die and/or the bottom die can each include devices such as computing units, Analog-to-Digital converters, analog circuits, RF circuits, logic circuits, sensors, Input/Output devices, and/or memory devices. One or more vertical interconnect structure (VIS) cells are formed adjacent one or more sides of the device. A VIS is formed in some or all of the VIS cells. One or more non-sensitive circuits, such as repeaters, diodes, and/or passive circuits (e.g., resistors, inductors, capacitors, transformers), are disposed in at least one VIS cell.