RF Module Layout With Separated Output Transformers for Multi-Band PAs
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Solution Overview
Problem
Differential power amplifiers used in multi-band radio frequency front-end circuits require multiple power amplifiers, leading to increased size and complexity, as each communication band needs its own amplifier, resulting in interference issues between high-power transmission signals.
Innovation Solution
A radio frequency module design with power amplifiers for different frequency bands placed on one principal surface and output transformers inside the module board or on another surface, avoiding nearest-neighbor relationships to prevent signal interference, while maintaining high Q-factors for efficient signal handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple differential power amplifiers are provided for respective communication bands to support multi-band technologies, then the communication device can operate across multiple frequency bands, but the total number of power amplifiers increases and the module size increases
Solution Approach 1:
The patent combines multiple power amplifiers for different communication bands (e.g., 700MHz, 2.6GHz, 3.5GHz bands) into a single integrated module with shared circuitry and compact arrangement, reducing the overall module size while maintaining multi-band support capability
Solution Approach 2:
The patent designs a universal power amplifier module that can handle multiple frequency bands using shared components and circuits, allowing a single module to perform multiple functions across different communication bands rather than requiring separate dedicated amplifiers for each band
2Volume of moving object
If multiple differential power amplifiers are arranged in close proximity to support multi-band technologies, then the module size is reduced, but signal interference occurs between high-power transmission signals
Solution Approach 1:
The patent extracts and separates the output transformer components from the main power amplifier circuitry, positioning them at different locations within the module to reduce electromagnetic interference between high-power transmission signals while maintaining a compact overall size
Solution Approach 2:
The patent introduces shielding structures and isolation circuits as intermediary elements between adjacent power amplifiers and output transformers, preventing direct electromagnetic interference while allowing close proximity arrangement for compactness
3Reliability
If a large number of circuit elements are used in differential power amplifiers, then the amplification performance is improved, but the radio frequency module increases in size
Solution Approach 1:
The patent merges multiple differential power amplifiers into a single integrated module with shared circuit elements and common structural support, reducing the overall module size while maintaining the amplification performance of each individual amplifier
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
The design achieves a compact, multi-band capable radio frequency module with reduced signal degradation by separating power amplifiers and output transformers, enhancing both size reduction and signal quality.
Implementation Method 1
The transformer includes magnetically-coupled two primary coils and one secondary coil
Data Source
AI summary
A radio frequency module includes: a module board including a first principal surface and a second principal surface; a first power amplifier; a second power amplifier; a first output transformer connected to the first power amplifier; and a second output transformer connected to the second power amplifier. The first power amplifier and the second power amplifier are disposed on the first principal surface. The first output transformer and the second output transformer are disposed inside the module board or on the second principal surface.