Balanced Amplifier Power Combiner Loss Reduction
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Solution Overview
Problem
Mobile communications equipment, such as mobile phones, face issues with transmit signal power variability due to load changes, leading to adverse effects on user safety and transmission reliability when using single amplification path power amplifiers.
Innovation Solution
A balanced amplifier configuration with two amplification paths having a 90-degree phase difference, combined by a power combiner to maintain constant output power and reduce loss, using phase shifters and capacitors in the output matching circuits to achieve phase balance and impedance matching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single amplifier with a single amplification path is used, then the device complexity is reduced, but the output power becomes susceptible to load variations
Solution Approach 1:
The single amplification path is divided into two separate amplification paths (positive path and negative path), each with its own amplifier. This segmentation allows each path to handle load variations independently, and when combined through the power combiner, produces a stable output power that is robust against load variations.
Solution Approach 2:
The invention changes the operating parameters by introducing phase shifting (90-degree phase difference) between the two amplification paths. This parameter change enables the power combiner to effectively combine the signals in a way that cancels out the effects of load variations, maintaining stable output power.
2Reliability
If a balanced amplifier with two amplification paths is used, then the output power stability against load variations is improved, but the device complexity increases
Solution Approach 1:
The two amplification paths are merged through a power combiner that combines the positive and negative path signals. This merging process integrates the benefits of both paths while canceling out the adverse effects of load variations, achieving output power stability without requiring separate output stages.
Solution Approach 2:
The power combiner acts as an intermediary device that receives signals from both amplification paths and combines them into a single stable output. This intermediary component is crucial for achieving the desired output power stability while managing the complexity of the balanced amplifier configuration.
3Reliability
If phase shifters are added to create a balanced amplifier, then the robustness against load variations is improved, but the power loss in the power combiner increases due to phase difference
Solution Approach 1:
The invention optimizes the phase shift parameters to achieve the minimum necessary 90-degree phase difference between the two amplification paths. This precise parameter control ensures that the power combiner operates at optimal efficiency, minimizing power loss while maintaining the robustness against load variations that the balanced amplifier provides.
Data Source
AI summary
When a power amplifier mounted in mobile communications equipment, such as a mobile-phone, is composed of a balanced amplifier, technology with which the loss of the electric power composition in a power combiner can be reduced is provided. According to the technical idea of the present embodiment, by dividing an isolation capacitor element into two capacitor elements with high symmetry and coupled in parallel, it is possible to make almost equal parasitic capacitance arising from these capacitor elements, even when the capacitor elements are formed as interlayer capacitor elements of the wiring substrate.