Parallel Power Amplifier Module With Phase Correction
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Solution Overview
Problem
Power amplification modules in multi-mode, multi-band mobile communication terminals face oscillations due to phase differences between output signals of power amplifiers operating in parallel, caused by environmental factors like temperature changes and load variations.
Innovation Solution
A power amplification module with two power amplifiers that can be selectively connected in parallel, featuring a phase correction circuit to eliminate phase differences between their output signals, ensuring stable operation across various communication systems and frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple power amplifiers are connected in parallel to support multiple communication systems and frequency bands, then the adaptability and power output are improved, but phase differences between output signals cause oscillations and stability deteriorates
Solution Approach 1:
A phase correction circuit is introduced as an intermediary component between the power amplifiers and the output. This circuit actively compensates for phase differences by adjusting the phase of signals from each power amplifier, thereby eliminating oscillations while maintaining the ability to support multiple communication systems and frequency bands through parallel amplifier operation.
2Power
If power amplifiers operate in parallel to increase power output, then the power capability is improved, but phase differences due to environmental factors cause oscillations
Solution Approach 1:
The phase correction circuit implements a feedback mechanism that continuously monitors the phase relationships between signals from multiple power amplifiers and actively adjusts the phase of each signal to maintain synchronization. This feedback control eliminates oscillations caused by phase differences while preserving the high power output capability of parallel amplifier operation.
Data Source
AI summary
Provided is a power amplification module that supports a plurality of communication systems. The power amplification module includes: two power amplifiers that can be selectively connected in parallel with each other; a switch that, in accordance with one communication system selected from among the plurality of communication systems, selects one power amplifier that is to operate by itself from among the two power amplifiers or selects the two power amplifiers and connects the two power amplifiers in parallel with each other; and a phase correction circuit that, when the two power amplifiers are both selected, corrects a phase difference by being selectively connected between the outputs of the two selected power amplifiers such that a phase difference is not generated between the output signals of the two selected power amplifiers.