Dual-Mode Power Amplifier Switching for Low-Energy Transmission
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Solution Overview
Problem
Radio devices, particularly those relying on battery power, face high energy consumption during transmission, with power amplifiers consuming energy inefficiently due to the conversion of supply power into signal power, leading to a need for improved power efficiency in communication systems.
Innovation Solution
A transmitter with a power amplifier that selectively operates in linear or non-linear modes based on allocated bandwidth, using polar modulation for non-linear operation when energy efficiency is prioritized and envelope tracking for linear operation when necessary, with a controller determining the mode based on bandwidth, modulation type, output power, and spectral leakage requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the power amplifier operates in linear mode to ensure transmission quality, then transmission quality is improved, but energy consumption increases
Solution Approach 1:
The power amplifier dynamically switches between linear and non-linear operating modes based on real-time transmission conditions, including allocated bandwidth, modulation type, output power level, and spectral leakage requirements. This dynamic adaptation allows the system to optimize energy consumption while maintaining transmission quality when necessary.
Solution Approach 2:
The system changes the operating parameters of the power amplifier by selecting different modes (linear vs. non-linear) depending on transmission requirements. The controller adjusts the mode of operation based on parameters such as allocated bandwidth, modulation type, output power, and spectral leakage constraints, thereby optimizing the balance between energy efficiency and transmission quality.
2Use of energy by moving object
If the power amplifier operates in non-linear mode to reduce energy consumption, then energy efficiency is improved, but spectral leakage increases
Solution Approach 1:
The controller monitors transmission conditions including spectral leakage levels and adjusts the power amplifier mode accordingly. When spectral leakage requirements are stringent, the system switches to linear mode to suppress harmful emissions, while allowing non-linear operation when spectral constraints are relaxed.
Solution Approach 2:
The operating mode of the power amplifier is changed based on spectral leakage requirements and other transmission parameters. The controller evaluates whether non-linear mode can be used without exceeding spectral masks, and switches to linear mode when harmful emissions must be suppressed.
3Productivity
If the allocated bandwidth is wide, then transmission capacity is improved, but the ability to use energy-saving non-linear mode is reduced
Solution Approach 1:
The system dynamically determines the operating mode based on the allocated bandwidth. For wide bandwidth allocations, linear mode is typically selected to maintain transmission quality across the broad spectrum, while narrow bandwidth allocations allow non-linear mode operation to maximize energy efficiency.
Solution Approach 2:
The controller changes the power amplifier mode based on the allocated bandwidth parameter. When bandwidth is wide, linear operation is chosen; when bandwidth is narrow, non-linear operation is permitted, thereby adapting energy consumption to transmission capacity requirements.
Data Source
AI summary
A transmitter comprising a power amplifier, a phase modulator, a switched DC-DC converter, all operating in dual mode, and a controller is disclosed. The power amplifier is arranged to selectively operate either in a first mode or in a second mode, wherein the first mode is a linear mode and the second mode is a non-linear mode in order to save power with least increasing cost in hardware. The transmitter is adapted to operate at different allocated bandwidths, for different radio standards while keeping minimum power consumption governed by the controller. A transceiver, a communication device, a method and a computer program are also disclosed.