Stacked Resistor Layout for Compact Semiconductor Chips
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Solution Overview
Problem
As semiconductor devices become increasingly highly integrated, the area occupied by resistor elements increases, leading to space constraints and potential failures due to heat generation and degradation of adjacent components.
Innovation Solution
The semiconductor device incorporates vertically or horizontally stacked resistor patterns on multiple chips, sharing layout areas with peripheral circuits, formed during existing process steps, to reduce area consumption and prevent failures by overlapping resistor elements with peripheral components, thus reducing heat generation and improving reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If resistor elements are used in highly integrated semiconductor devices, then the device functionality is improved, but the area occupied by resistor elements increases
Solution Approach 1:
The patent transitions from planar resistor layouts to three-dimensional stacked configurations. Multiple resistor elements are arranged vertically across different layers and chips, utilizing the third dimension (height/stacking direction) to accommodate more resistor elements without increasing the planar footprint. This dimensional transition directly resolves the contradiction by enabling higher integration while maintaining compact area.
Solution Approach 2:
The patent implements nested arrangements where resistor elements are embedded within and around other device structures. Resistor patterns are integrated within interlayer dielectric layers, around transistor regions, and in overlapping configurations where one resistor element is positioned above or beside another, creating a nested spatial arrangement that maximizes area utilization.
2Measurement precision
If resistor elements are increased in area to achieve higher resistance values, then the resistance precision is improved, but the device area increases
Solution Approach 1:
The patent achieves higher resistance values by extending resistor patterns in the vertical dimension through multiple stacked layers rather than increasing planar area. Resistor elements are formed across multiple interlayer dielectric layers with conductive patterns extending vertically, allowing precise resistance control through layered stacking density rather than lateral expansion.
Solution Approach 2:
The patent combines multiple resistor elements in series across different layers and chips to achieve high resistance values. By stacking and coupling individual resistor elements vertically, the total resistance accumulates through the series connection of multiple smaller resistance units, maintaining precision while minimizing area.
3Area of stationary object
If resistor elements are densely packed to reduce area, then the area is reduced, but the heat generation increases causing failures
Solution Approach 1:
The patent divides the resistor structure into multiple segmented elements distributed across different layers and spatial locations. Instead of one large concentrated resistor, the total resistance is achieved through multiple smaller resistor segments stacked vertically and distributed across the device structure, which disperses heat generation across multiple locations and reduces thermal concentration.
Solution Approach 2:
The patent transitions heat dissipation from a two-dimensional planar problem to a three-dimensional solution by distributing resistor elements across multiple vertical layers. This vertical distribution increases the effective heat dissipation volume and allows heat to dissipate through multiple pathways in the stacking direction, reducing thermal buildup in any single location.
4Area of stationary object
If resistor elements are stacked vertically on multiple chips, then the area consumption is reduced, but the device complexity increases
Solution Approach 1:
The patent employs universal process steps and materials that serve multiple functions. The same dielectric layers, conductor patterns, and fabrication processes used for transistor interconnections are also utilized to form resistor elements, eliminating the need for separate dedicated resistor fabrication processes. This multi-functionality reduces complexity despite the stacked three-dimensional configuration.
Solution Approach 2:
The patent merges the formation of resistor elements with the existing transistor fabrication process. Resistor patterns are formed using the same interlayer dielectric deposition, conductor material deposition, and patterning steps as the surrounding circuit elements, integrating resistor creation into the universal manufacturing flow rather than requiring separate process modules.
Data Source
AI summary
A semiconductor device includes a first pad defined on one surface of a first chip; a second pad defined on one surface of a second chip which is stacked on the first chip, and bonded to the first pad; a first resistor element defined in the first chip, and coupled to the first pad; and a second resistor element defined in the second chip, and coupled to the second pad.