RF Module IC Layout Using Ground Vias to Suppress Coupling
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Solution Overview
Problem
Inductive coupling and/or capacitive coupling between multiple radio-frequency elements or electric circuits integrated in semiconductor integrated circuits can deteriorate the electric characteristics of radio-frequency front-end modules.
Innovation Solution
A semiconductor integrated circuit design that includes via conductors connected to ground potential between radio-frequency elements, such as inductors, to suppress coupling, with through vias extending through the semiconductor IC to further reduce coupling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If multiple radio-frequency elements are integrated in a semiconductor integrated circuit for downsizing, then the size of the radio-frequency module is reduced, but inductive coupling and/or capacitive coupling occurs between the elements which deteriorates electric characteristics
Solution Approach 1:
A via conductor is introduced as an intermediary element between the first radio-frequency element and the second radio-frequency element. This via conductor is connected to ground potential and acts as a shield to suppress inductive coupling and capacitive coupling between the two elements, thereby maintaining electric characteristics while enabling integration for downsizing.
2Device complexity
If multiple radio-frequency elements are integrated in a semiconductor integrated circuit, then device complexity is reduced through integration, but harmful electromagnetic coupling between elements increases
Solution Approach 1:
The via conductor serves as a ground-connected intermediary that blocks electromagnetic coupling between integrated radio-frequency elements, allowing complex multi-element integration without suffering from harmful inductive and capacitive coupling effects.
Solution Approach 2:
The via conductor connected to ground potential converts the potentially harmful electromagnetic fields between adjacent radio-frequency elements into beneficial ground-referenced shielding, transforming the coupling problem into a solution where the ground connection actively suppresses unwanted interactions.
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
Improves the electric characteristics of radio-frequency paths by reducing inductive and capacitive coupling between elements, enhancing performance and allowing miniaturization of the radio-frequency module.
Implementation Method 1
inductive coupling and/or capacitive coupling may occur between these multiple radio-frequency elements or these multiple electric circuits
Implementation Method 2
inductive coupling and/or capacitive coupling may occur between these multiple radio-frequency elements or these multiple electric circuits
Data Source
AI summary
A semiconductor IC includes a first radio-frequency element (e.g., an inductor in a low-noise amplifier), a second radio-frequency element (e.g., an inductor in a low-noise amplifier), a first via conductor (e.g., a via conductor that is placed between the first radio-frequency element and the second radio-frequency element and that is connected to a ground potential.