Capacitive Isolation Structure for Reverse Signal Nets
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Solution Overview
Problem
Parasitic capacitance in integrated circuits leads to timing performance degradation and increased power consumption due to capacitive coupling between adjacent conductive lines, particularly in reverse signal nets where input and output lines are in close proximity and have opposite voltage states.
Innovation Solution
The introduction of capacitive isolation structures between input and output conductive lines in integrated circuit layouts, either by moving these lines to increase separation or adding dielectric material, to decouple the capacitive coupling and reduce parasitic capacitance, thereby modifying the layout to minimize capacitive coupling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If conductive lines are placed in close proximity to reduce area, then area is reduced, but parasitic capacitance increases causing timing degradation and power consumption increase
Solution Approach 1:
A capacitive isolation structure is introduced as an intermediary element between the first and second conductive lines. This isolation structure decouples the capacitive coupling between adjacent lines, reducing parasitic capacitance and its associated power consumption while allowing the lines to remain in close proximity for area efficiency
2Area of moving object
If conductive lines are placed in close proximity to reduce area, then area is reduced, but timing performance degrades due to increased parasitic capacitance
Solution Approach 1:
The capacitive isolation structure serves as a mediator that reduces the capacitive coupling between adjacent conductive lines. By inserting this isolation structure, the parasitic capacitance is reduced, which improves signal propagation timing while maintaining the compact layout configuration
3Object-affected harmful factors
If capacitive isolation structure is added to reduce parasitic capacitance, then parasitic capacitance is reduced, but device complexity increases
Solution Approach 1:
The method automatically determines the optimal parameters for the capacitive isolation structure, including its position, length, and configuration, based on the specific geometric relationships between adjacent conductive lines. This automated parameter optimization reduces the manual design complexity while achieving effective parasitic capacitance reduction
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 effectively reduces parasitic capacitance, leading to improved switching speed and decreased power consumption, with reported increases in speed of up to 6.63% and power reduction of up to 8.9% across standard cell libraries.
Implementation Method 1
Parasitic capacitance in an integrated circuit causes timing performance degradation and increased power consumption during operation of the integrated circuit. Parasitic capacitance in an integrated circuit occurs between adjacent conductive lines in an integrated circuit where one conductive line carries a voltage and the other line is at ground.
Implementation Method 2
adding dielectric material, to decouple the capacitive coupling and reduce parasitic capacitance
Data Source
AI summary
A device includes a first conductive line as an input line. The device further includes a second conductive line as an output line, wherein the first conductive line and the second conductive line are in a same level of the integrated circuit. The device further includes a first passive isolation structure between the first conductive line and the second conductive line, wherein the first passive isolation structure and the second conductive line are each positioned at an integer multiple of an interval between the first conductive line and the first passive isolation structure.