RF Module Ground Electrode Pattern Design for Noise Suppression
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Solution Overview
Problem
The complexity of radio-frequency front-end modules in mobile communication devices leads to degradation of electrical circuit characteristics, particularly due to the interaction between ground electrode patterns and integrated circuits.
Innovation Solution
A radio-frequency module design where a ground electrode pattern is formed on the module substrate, overlapping at least part of the control/power supply circuit but not the low-noise amplifiers or switches, thereby preventing noise interference and reducing parasitic capacitance, which helps in maintaining improved electrical characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a ground electrode pattern is formed overlapping the integrated circuit to improve grounding and reduce noise, then noise immunity is improved, but parasitic capacitance increases degrading circuit characteristics
Solution Approach 1:
The patent applies local quality by differentiating the grounding approach for different circuit regions. The ground electrode pattern is positioned to overlap control/power supply circuits (which benefit from noise shielding) while deliberately avoiding overlap with RF circuits (which suffer from parasitic capacitance). This localized differentiation optimizes each region's electrical characteristics according to its specific functional requirements.
Solution Approach 2:
The patent segments the integrated circuit into two functional groups: control/power supply circuits and RF circuits. By segmenting the grounding strategy accordingly, the design allows aggressive grounding (with overlap) for control circuits while using conservative grounding (without overlap) for RF circuits, thus resolving the contradiction between noise immunity and circuit characteristics.
2Adaptability or versatility
If the radio-frequency module uses complex multiband operation to support more communication bands, then adaptability is improved, but device complexity increases leading to characteristic degradation
Solution Approach 1:
The patent segments the radio-frequency module into distinct functional blocks (control circuit, power supply circuit, RF circuit) with differentiated grounding strategies. This segmentation allows the module to handle multiple frequency bands without allowing grounding-induced parasitic effects to degrade performance across all circuits uniformly.
Solution Approach 2:
By applying different grounding configurations to different functional blocks within the multiband module, the patent enables complex multiband operation while maintaining optimal electrical characteristics in each segment, thus managing overall device complexity.
Data Source
AI summary
A radio-frequency module includes a module substrate having a major surface on which a ground electrode pattern is formed and an integrated circuit disposed on the major surface of the module substrate. The integrated circuit includes a control/power supply circuit having at least one of a control circuit and a power supply circuit and a second electrical circuit having at least one of an amplifier, a switch, and a filter. In plan view, the ground electrode pattern overlaps at least a part of the control/power supply circuit and does not overlap at least a part of the second electrical circuit.