Width-Modulated Trace Meanders for Impedance Discontinuity Mitigation

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Solution Overview

Problem

Impedance discontinuities in signaling traces become increasingly disruptive at high signaling rates, limiting the signaling-rate ceiling due to trace pitch disparity and resulting in temporal and voltage signaling margins shrinkage.

Innovation Solution

Implementing width-modulated meanders in signaling traces, specifically widening trace widths in meandered regions to equalize impedance and reduce discontinuity, particularly for differential and single-ended conductors, using design-automation tools to optimize trace layouts.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Length of moving object

If trace pitch is increased to accommodate meandered routing, then route length equalization is achieved, but impedance discontinuity increases

Engineering Contradiction:

Improveroute lengthVSAvoidimpedance discontinuity

Core Design Contradiction:

Length of moving objectVSReliability

Solution Approach 1:

The patent applies local quality by varying the trace width specifically in the meandered regions where pitch increases, while maintaining standard width in non-meandered regions. This localized modification equalizes impedance across different trace sections without affecting the entire trace structure.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent changes the geometric parameter of trace width in meandered regions to compensate for pitch-induced impedance changes. By adjusting this parameter locally, the characteristic impedance is equalized across traces with different routing lengths.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If trace width is increased in meandered regions, then impedance is equalized, but manufacturing complexity increases

Engineering Contradiction:

Improveimpedance equalizationVSAvoidtrace fabrication

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The width-modulated design applies different trace widths only in specific meandered regions rather than uniformly across all traces. This localized approach maintains manufacturing simplicity for the majority of the trace length while achieving impedance equalization where needed.

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS20260059649A1Signaling Trace with Width-Modulated Discontinuity Mitigation

Publication Date: 2026.02.26 ASTERA LABS INC

AI summary

Signaling conductors with one or more length-tuning route meanders are selectively widened within the meandered region(s) to reduce impedance discontinuity caused by trace pitch disparity.