Power Amplifier Module With Transmission Line Signal Combining
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Solution Overview
Problem
Existing RF front-end circuits in mobile terminals struggle to achieve wideband signal combination while maintaining a compact module size due to the use of LC ladder circuits and quarter-wave lines, which limit bandwidth and increase module size.
Innovation Solution
A power amplifier module design incorporating first and second amplifiers optimized for PC3, impedance transformers with transmission line transformers, and a combiner with transmission line transformers to combine signals, enabling wideband operation and reducing module size by eliminating unnecessary components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If LC ladder circuit is used for matching network, then bandwidth is limited, but circuit structure is simple
Solution Approach 1:
The patent changes the fundamental parameters of the matching network by replacing the LC ladder circuit with a transmission line transformer structure. This parameter change enables wideband operation while maintaining circuit simplicity, as the transmission line transformer inherently provides broadband impedance transformation without requiring multiple frequency-specific components.
Solution Approach 2:
The patent substitutes the traditional electrical circuit approach (LC ladder) with a transmission line-based approach. The transmission line transformer uses distributed elements along the line to achieve impedance transformation, replacing the concentrated LC components and enabling wideband signal combination.
2Adaptability or versatility
If quarter-wave lines are used for signal combination, then bandwidth is limited due to frequency-dependent line lengths, but circuit structure is simple
Solution Approach 1:
The patent changes the line length parameter from frequency-specific quarter-wave lengths to a unified transmission line structure that operates across a wide frequency range. The transmission line transformer maintains effective impedance transformation and signal combination across multiple frequency bands without requiring adjustment of line lengths for each frequency.
3Adaptability or versatility
If quarter-wave lines are used for signal combination, then module size increases due to large area occupied by each line, but signal combination is achieved
Solution Approach 1:
The patent merges the impedance transformation function and the signal combination function into a single transmission line transformer structure. This consolidation eliminates the need for separate quarter-wave lines for each amplifier, reducing the total area occupied by transmission lines while maintaining wideband signal combination capability.
Solution Approach 2:
The transmission line transformer structure serves multiple functions simultaneously: it provides impedance transformation for multiple amplifiers and combines their output signals across a wide frequency band. This multi-functionality reduces the overall circuit complexity and area compared to using separate dedicated lines for each function.
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 efficient wideband signal combination with reduced module size by optimizing amplifiers for PC3, using transmission line transformers for impedance transformation, and integrating a combiner to support multiple frequency bands, thereby enhancing transmission efficiency and minimizing power loss.
Implementation Method 1
Each of the first impedance transformer (120a), the second impedance transformer (120b), and the combiner (180) includes a transmission line transformer
Implementation Method 2
a first amplifier configured to amplify a power level of a first input signal in a predetermined frequency band and output a first signal of a first power level
Implementation Method 3
a combiner configured to combine the first signal inputted through the first impedance transformer and the second signal inputted through the second impedance transformer into an output signal of a second power level larger than the first power level
Data Source
AI summary
A power amplifier module includes a first amplifier that amplifies a power level of a first input signal in a predetermined frequency band and outputs a first signal of a first power level; a first impedance transformer connected to the first amplifier and including a transmission line transformer; a second amplifier that amplifies a power level of a second input signal in the predetermined frequency band and outputs a second signal of the first power level; a second impedance transformer connected to the second amplifier and including a transmission line transformer; and a combiner that combines the first signal inputted through the first impedance transformer and the second signal inputted through the second impedance transformer into an output signal of a second power level larger than the first power level and includes a transmission line transformer.