Multi-Level Supply Modulator for Power Amplifier PAPR Efficiency
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Solution Overview
Problem
Wireless communication devices face efficiency issues with power amplifiers due to high peak-to-average power ratio (PAPR) and wide bandwidth requirements, leading to decreased power amplifier efficiency and increased energy waste when using constant power supplies.
Innovation Solution
A supply modulator that includes a voltage generator capable of producing multiple voltage levels and a switch unit to selectively provide these voltages to a power amplifier based on an envelope signal, implementing Envelope Tracking (ET) or Average Power Tracking (APT) techniques to adaptively modulate the supply voltage, reducing power consumption and circuit design area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a constant power supply is used for the power amplifier, then the circuit design is simple, but the power amplifier efficiency decreases due to high PAPR and wide bandwidth requirements
Solution Approach 1:
The patent implements dynamic supply voltage modulation by switching between multiple voltage levels (V1, V2, V3, V4) based on the envelope signal amplitude. The voltage generator dynamically selects and outputs different voltage levels corresponding to different signal power levels, enabling the power amplifier to operate efficiently across varying power conditions while maintaining relatively simple circuit architecture through controlled impedance switching.
2Loss of energy
If multiple voltage levels are generated and switched dynamically, then power amplifier efficiency increases, but the circuit design area and complexity increase
Solution Approach 1:
The patent merges multiple voltage generation functions into a single integrated voltage generator that can output multiple voltage levels (V1, V2, V3, V4) through internal switching and control logic. This consolidation approach provides multiple supply voltage levels while maintaining a compact circuit design, avoiding the need for separate voltage generation circuits for each level.
Solution Approach 2:
The supply voltage is segmented into multiple discrete levels (V1, V2, V3, V4) that correspond to different signal power ranges. The voltage generator selectively outputs appropriate voltage levels based on the envelope signal amplitude, enabling fine-grained power control without requiring continuous voltage adjustment, thus simplifying the control mechanism while achieving efficient power amplifier operation.
3Loss of energy
If supply voltage is dynamically adjusted based on envelope signal, then energy waste is reduced, but the device requires more complex voltage generation and switching circuits
Solution Approach 1:
The voltage generator automatically adjusts the supply voltage level based on the envelope signal amplitude without requiring external intervention. The controller within the voltage generator monitors the envelope signal and autonomously selects the appropriate voltage level (V1-V4) to match the current signal power, enabling the system to self-optimize power efficiency while minimizing energy waste through real-time adaptive voltage modulation.
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 enhances power amplifier efficiency, reduces energy waste, and extends battery life by dynamically adjusting the supply voltage based on the envelope signal, minimizing voltage differences between the RF output and supply voltage.
Implementation Method 1
generate the first selection supply voltage by performing DC-DC conversion on a supply voltage input from a power supply
Data Source
AI summary
A supply modulator includes: a voltage generator including output terminals respectively outputting voltages having different levels, and configured to select, in response to a selection control signal corresponding to an envelope signal, at least one of the voltages as a selection supply voltage and to generate the selection supply voltage by performing DC-DC conversion on a power supply voltage; and a switch unit configured to connect an output terminal through which the selection supply voltage is output to a power amplifier, in response to a connection control signal corresponding to the envelope signal.