Power Amplifier Tracking Mode Switching for Multi-Channel Linearity
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Solution Overview
Problem
When applying envelope tracking mode to a power amplifier circuit for simultaneous transmission of signals across multiple channels in a wider communication band, signal quality deteriorates, and existing technologies fail to improve power-added efficiency (PAE) effectively while maintaining signal quality.
Innovation Solution
A power amplifier circuit that dynamically adjusts its power supply voltage using a combination of envelope tracking and average power tracking modes based on the frequency gap between channels, switching between these modes to optimize PAE and reduce signal distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If envelope tracking mode is applied to improve power-added efficiency, then PAE is improved, but signal quality deteriorates when transmitting multiple signals across wider frequency bands
Solution Approach 1:
The system dynamically switches between envelope tracking mode and average power tracking mode based on the frequency gap between channels. When the frequency gap is small (first condition), envelope tracking mode is used to maximize PAE. When the frequency gap is large (second condition), average power tracking mode is used to maintain signal quality. This dynamic adaptation resolves the contradiction by adjusting the power supply strategy according to operating conditions.
Solution Approach 2:
The invention changes the power supply voltage characteristics based on the frequency gap parameter. For small frequency gaps, the power supply voltage follows the envelope of the combined signal to improve efficiency. For large frequency gaps, the power supply voltage is adjusted to maintain linearity and reduce distortion. This parameter change strategy allows the system to optimize PAE while maintaining signal quality under different operating conditions.
2Use of energy by moving object
If envelope tracking mode is used for simultaneous multi-channel transmission, then power efficiency improves, but linearity and distortion performance worsen
Solution Approach 1:
The system dynamically selects between envelope tracking and average power tracking modes based on the frequency gap between channels. This dynamic selection ensures that linearity requirements are met by switching to average power tracking mode when frequency gaps are large, while maximizing power efficiency through envelope tracking mode when frequency gaps are small.
Solution Approach 2:
The invention changes the power supply voltage waveform characteristics based on the frequency gap parameter. For small frequency gaps, the power supply voltage tracks the envelope to improve efficiency. For large frequency gaps, the power supply voltage is controlled to maintain constant amplitude and reduce distortion, thereby preserving linearity.
3Device complexity
If a single tracking mode is used for all frequency gaps, then device complexity is reduced, but adaptability to different frequency configurations worsens
Solution Approach 1:
The system dynamically adapts its power supply strategy by switching between envelope tracking mode and average power tracking mode based on the frequency gap between channels. This dynamic adaptation enables the device to handle different frequency configurations optimally without requiring multiple dedicated circuits, thus maintaining relatively low complexity while achieving high adaptability.
Solution Approach 2:
The invention makes a single power supply circuit capable of operating in multiple modes (envelope tracking and average power tracking) depending on the frequency gap condition. This multi-functionality allows the same hardware to adapt to different frequency configurations and channel combinations, achieving versatility without proportionally increasing device complexity.
Data Source
AI summary
A circuit includes a power amplifier configured to amplify a first signal in a first channel and a second signal in a second channel under a condition that the first signal and the second signal are simultaneously transmitted. An envelope tracking mode is applied to the power amplifier under a condition that a frequency gap between the first channel and the second channel is less than a first threshold width, and an average power tracking mode is applied to the power amplifier under a condition that the frequency gap is at least the first threshold width.