Supply Modulator With Discrete Envelope Tracking for PA Efficiency
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Solution Overview
Problem
In wireless communication devices, the efficiency of power amplifiers decreases due to high peak-to-average power ratio (PAPR) and high bandwidth, leading to reduced power efficiency, especially when powered by batteries, and existing solutions like average power tracking (APT) and envelope tracking (ET) technologies face challenges in optimizing power management.
Innovation Solution
A supply modulator is designed with multiple output voltage regulators, switching regulators, and a controller system that can operate in average power tracking or discrete level-envelope tracking modes, using a switch array and coupling capacitors to dynamically adjust output voltages and reduce heat loss, thereby enhancing power efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a power amplifier operates at high PAPR and high bandwidth, then communication performance is improved, but power efficiency deteriorates
Solution Approach 1:
The patent implements dynamic supply voltage modulation that adapts to the instantaneous envelope of the RF signal. The supply modulator dynamically adjusts the power supply voltage to the power amplifier based on the signal envelope, enabling the amplifier to operate efficiently across varying power levels while maintaining high PAPR and bandwidth performance.
Solution Approach 2:
The patent changes the supply voltage parameter dynamically to match the signal envelope characteristics. By modulating the supply voltage in accordance with the RF signal envelope, the system optimizes power efficiency while preserving communication performance at high PAPR and bandwidth conditions.
2Loss of energy
If average power tracking technology is used, then power efficiency is improved, but device complexity increases
Solution Approach 1:
The supply modulator is designed to support multiple operating modes including average power tracking, envelope tracking, and discrete level envelope tracking. This multi-functional capability allows the same device structure to achieve power efficiency improvements across different operational scenarios without requiring separate dedicated circuits for each mode.
Solution Approach 2:
The system dynamically switches between different tracking modes based on operational requirements. The supply modulator can adaptively select between average power tracking and envelope tracking modes, providing flexible power efficiency optimization while managing device complexity through unified control architecture.
3Loss of energy
If envelope tracking technology is used, then power efficiency is improved, but device complexity increases
Solution Approach 1:
The supply modulator integrates multiple tracking functionalities including envelope tracking and discrete level envelope tracking within a single device architecture. This universal design enables the system to achieve power efficiency improvements through envelope tracking while avoiding the need for separate dedicated circuits, thereby managing overall device complexity.
4Loss of energy
If multiple output voltage regulators are used, then power efficiency is improved, but device complexity increases
Solution Approach 1:
The power supply system is segmented into multiple output voltage regulators that provide different voltage levels. This segmentation enables efficient power delivery at multiple voltage stages, improving overall power efficiency by matching supply voltages to specific operational requirements of different circuit blocks.
Solution Approach 2:
Multiple output voltage regulators are integrated within a unified supply modulator architecture that shares common control and modulation resources. This merging approach enables the system to achieve power efficiency improvements through multi-voltage regulation while avoiding the complexity of completely separate regulator systems.
5Device complexity
If the number of switches in the switch array is reduced, then device complexity is reduced, but power efficiency deteriorates
Solution Approach 1:
The switch array operates dynamically with optimized switching patterns that achieve effective power management with reduced switch count. The discrete level envelope tracking mode utilizes selective switch activation based on signal envelope levels, maintaining power efficiency while minimizing the number of required switches through intelligent switching control.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution improves power efficiency by reducing heat loss and minimizing the size of the switch array, allowing for more efficient power management and reduced operational costs, while maintaining high output voltage levels and reducing the number of output capacitors and switches.
Implementation Method 1
a coupling capacitor having an end connected to the switch array and another end connected to the power amplifier
Data Source
AI summary
A supply modulator including a multiple output voltage regulator (MOVR) configured to output voltages in a discrete level-envelope tracking mode (DLETM) having different levels from each other respectively corresponding to reference output voltage signals, a switching regulator configured to output a switching regulator voltage, an output voltage being based on the switching regulator voltage and a selected voltage among the voltages in the DLETM and based on the switching regulator voltage in an average power tracking mode, a switching regulator controller configured to sense an output current of the MOVR to obtain a sensing value, and control the switching regulator based on the sensing value in the DLETM, a switch array comprising switches respectively corresponding to the voltages and configured to selectively connect the selected voltage to a power amplifier by performing a switching operation, and a switch controller configured to control the switching operation.