Multi-Phase Clock Routing to Balance Capacitance and Delay
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Solution Overview
Problem
High-speed data communication in microprocessors and graphics processors leads to significant power consumption due to capacitive loading and unequal delays in multi-phase clock pathways, which are exacerbated by the need for intermediate ground guard lines and increased chip area.
Innovation Solution
The arrangement of clock phases in a semiconductor chip's pathway, where each wire spends equal time near the edges and midline, and the use of dummy clock phases to balance capacitive loading, reduces equivalent capacitance and eliminates the need for ground guard lines, thereby minimizing power consumption and chip area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple clock phases are transmitted in parallel, then data synchronization is improved, but capacitive loading and power consumption increase
Solution Approach 1:
The patent changes the physical arrangement parameter of clock phase wires, specifically their longitudinal positioning along the pathway. By having each wire spend equal time near edges versus midline, the capacitive loading parameters are balanced across all clock phases, reducing total power consumption while maintaining synchronization reliability
2Area of stationary object
If clock phases are placed adjacent to each other, then chip area is reduced, but unequal capacitive loading causes unequal delays
Solution Approach 1:
The patent applies local quality by creating non-uniform longitudinal distribution of wires. Each wire experiences different local environments (near edge vs near midline) for equal durations, balancing the overall capacitive loading. This local variation in positioning compensates for the global proximity of adjacent phases, maintaining equal delays while reducing chip area
3Reliability
If ground guard lines are added to reduce interference, then signal integrity is improved, but chip area and power consumption increase
Solution Approach 1:
The patent extracts and eliminates the ground guard lines from the clock pathway structure. By achieving signal integrity through balanced capacitive loading via strategic wire positioning, the design removes the need for additional ground guard lines, thereby reducing chip area while maintaining signal integrity
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 reduces power consumption and chip area by balancing capacitive loading, achieving lower energy requirements for charging/discharging clock transmission lines and optimizing data transmission efficiency.
Implementation Method 1
These often exhibit capacitive loading and resulting delays and power consumption
Data Source
AI summary
Various semiconductor chip clock signal pathways are disclosed. In one aspect, a semiconductor chip with a receiver includes a clock signals pathway for conveying plural clock phases in the receiver. The clock signals pathway includes plural wires in an arrangement that has a first edge, a second edge separated from the first edge and a midline between the first edge and the second edge. Each of the wires conveys a clock phase. The wires of the arrangement are routed so that, along a length of the clock signals pathway, each of the wires spends about the same percentage of time at or nearer the first edge or the second edge and at or nearer the midline.