Multi-Band Power Amplifier Impedance Tuning for Carrier Aggregation
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Solution Overview
Problem
Existing power amplifier modules face reduced impedance matching and efficiency in amplification when supporting carrier aggregation (CA) due to changes in output impedance matching between the power amplifier circuit and load impedance, especially when multiple frequency bands are used simultaneously.
Innovation Solution
A multi-band power amplifier module is designed with a transmission input switch to selectively route signals to suitable power amplifier circuits and a tuning circuit to adjust impedance matching between power amplifier circuits and output terminals, ensuring optimal impedance matching across different frequency bands and reducing signal loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the output terminal of a power amplifier circuit is connected to a single path or two paths to support carrier aggregation, then the power amplifier module can handle multiple frequency bands simultaneously, but the impedance matching between the power amplifier circuit and load impedance changes, reducing amplification efficiency
Solution Approach 1:
The patent introduces a switching mechanism that dynamically changes the connection state of the power amplifier circuit output terminal. The switch can selectively connect the output terminal to either a single path or two paths based on the operating mode (single-band or carrier aggregation), thereby dynamically adapting the impedance matching state to maintain amplification efficiency across different operational configurations
Solution Approach 2:
The patent changes the electrical connection parameters by introducing a switch that can alter the impedance matching characteristics. By controlling the switch state, the system can adjust the effective load impedance seen by the power amplifier circuit, thereby optimizing amplification efficiency for different carrier aggregation configurations
Data Source
AI summary
A multi-band power amplifier module includes at least one transmission input terminal, at least one power amplifier circuit that receives a first transmission signal and a second transmission signal through the at least one transmission input terminal, a first filter circuit that allows the first transmission signal to pass therethrough, a second filter circuit that allows the second transmission signal to pass therethrough, at least one transmission output terminal through which the first and second transmission signals output from the first and second filter circuits are output, a transmission output switch that outputs each of the first and second transmission signals output from the at least one power amplifier circuit to the first filter circuit or the second filter circuit, and a first tuning circuit that adjusts impedance matching between the at least one power amplifier circuit and the at least one transmission output terminal.