Transmission Line Pad Layout for Low-Coupling Signal Routing
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Solution Overview
Problem
Existing transmission lines experience unwanted coupling between signal lines and between signal lines and ground electrodes due to increased density of electrode pads, leading to inefficiencies and size increments in external connection portions.
Innovation Solution
The configuration includes separate regions for electrode pads with varying frequencies, where higher frequency signal lines are surrounded by ground electrodes, and lower frequency signal lines are positioned without ground electrode coverage, reducing capacitive coupling and allowing for a compact external connection portion size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the number of signal lines is increased in the transmission line, then the signal transmission capability is improved, but the density of electrode pads in the external connection portion is increased, leading to unwanted coupling between signal lines and between signal lines and ground electrodes
Solution Approach 1:
The external connection portion is divided into a first region and a second region, with different ground electrode configurations for different frequency ranges. The first region handles high-frequency signals with complete ground electrode surrounding, while the second region handles low-frequency signals with partial ground electrode coverage, reducing unwanted coupling in each segment
Solution Approach 2:
Different regions of the external connection portion are assigned different ground electrode configurations based on the frequency characteristics of the signal lines. High-frequency signal lines receive complete ground electrode surrounding for shielding, while low-frequency signal lines have reduced ground electrode coverage, optimizing both signal integrity and coupling reduction
2Quantity of substance
If the density of electrode pads is increased to accommodate more signal lines, then the signal transmission capability is improved, but the size of the external connection portion increases due to increased spacing requirements to reduce coupling
Solution Approach 1:
The external connection portion is segmented into regions with different ground electrode configurations, allowing compact arrangement of electrode pads while maintaining signal integrity through selective grounding in high-frequency regions
Solution Approach 2:
The ground electrode configuration is changed based on frequency parameters - complete surrounding for high-frequency signals and partial coverage for low-frequency signals - enabling compact design without increasing external connection portion size
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 configuration significantly reduces unwanted coupling between signal lines and ground electrodes while maintaining a compact external connection portion size, enhancing signal isolation and reducing transmission loss.
Implementation Method 1
Each of the first electrode pad and the second electrode pad is surrounded by a ground electrode in a plan view
Implementation Method 2
unwanted coupling, through an electrode pad, between the signal lines and between a signal line and a ground electrode easily occurs
Data Source
AI summary
A transmission line includes first, second, third, and fourth signal lines, and first, second, third, and fourth electrode pads respectively connected thereto. A first main surface of an external connection portion includes a first region in which the first electrode pad and the second electrode pad are provided, and a second region in which the third electrode pad and the fourth electrode pad are provided. Each of the first electrode pad and the second electrode pad, in a plan view, is surrounded by a ground electrode, and at least one of the third electrode pad and the fourth electrode pad, in the plan view, includes a portion that is not surrounded by the ground electrode.