SIMO Supply Modulator for Fast ET/APT Voltage Tracking
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Solution Overview
Problem
Wireless communication devices face inefficiencies in power amplifier performance due to high peak-to-average power ratio (PAPR) and high bandwidth, leading to decreased power efficiency when using conventional power amplifiers connected to batteries.
Innovation Solution
A supply modulator that operates in both envelope tracking (ET) and average power tracking (APT) modes, utilizing a linear regulator, switching regulator, and single inductor multiple output (SIMO) converter to dynamically adjust output voltage and provide efficient power supply to the power amplifier, with a main controller managing the tracking mode and controlling the associated components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a conventional power amplifier is connected with a battery, then the power amplifier can operate continuously, but the power efficiency decreases due to high PAPR and high bandwidth
Solution Approach 1:
The patent implements dynamic voltage adjustment through envelope tracking technology, where the power supply voltage to the power amplifier is dynamically modulated to follow the envelope of the RF signal. This dynamic operation allows the power amplifier to maintain high efficiency across varying signal conditions while adapting to high PAPR and bandwidth requirements, resolving the contradiction between continuous operation and power efficiency.
Solution Approach 2:
The patent changes the operating parameters of the power amplifier by implementing average power tracking (APT) technology, which adjusts the average power level of the amplifier based on the signal characteristics. This parameter change enables the system to optimize power efficiency while maintaining the ability to handle high PAPR and bandwidth signals, thus resolving the contradiction between power loss and adaptability.
2Speed
If voltage changes rapidly to improve response speed, then modulation operation performance improves, but signal distortion may occur
Solution Approach 1:
The patent introduces capacitors as intermediary energy storage elements between the power supply and the power amplifier. These capacitors act as buffers that can rapidly discharge or charge to provide fast voltage changes when needed, while their energy storage capability smooths out voltage transitions to prevent excessive distortion. This intermediary component enables both fast response and signal quality maintenance.
Solution Approach 2:
The patent implements prior cushioning by pre-charging capacitors during periods of lower signal demand and using this stored energy to rapidly respond to sudden voltage requirements. This beforehand preparation of energy reserves allows the system to achieve fast voltage changes without causing signal distortion, as the capacitors provide the necessary current bursts without requiring rapid switching of the main power supply.
3Adaptability or versatility
If multiple regulators are used to support both ET and APT modes, then functionality and adaptability improve, but device complexity increases
Solution Approach 1:
The patent implements multi-functionality by designing the power supply circuit to support both envelope tracking (ET) and average power tracking (APT) modes through a unified architecture. The same basic regulator circuit can operate in different modes by changing control parameters and switching configurations, eliminating the need for completely separate regulator circuits for each mode. This universal design maintains adaptability while reducing overall system complexity.
Solution Approach 2:
The patent segments the power supply function into distinct operational modes (ET and APT) that can be selectively activated based on signal conditions. By dividing the overall power supply operation into mode-specific segments with dedicated control logic, the system can switch between different operational characteristics without requiring fully independent regulator circuits, thus managing complexity while maintaining versatility.
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
Improves power use efficiency and modulation operation performance by enabling rapid voltage changes and preventing signal distortion, enhancing overall power amplifier efficiency and extending battery life.
Implementation Method 1
a linear regulator configured to generate the output voltage in the envelope tracking mode
Implementation Method 2
A switching regulator is configured to generate, with the linear regulator, the output voltage in the envelope tracking mode and selectively operates to generate the output voltage in the average power tracking mode
Implementation Method 3
The SIMO converter includes a first capacitor connected with a power supply terminal of the linear regulator
Implementation Method 4
a first capacitor connected with a power supply terminal of the linear regulator and a second capacitor selectively connected with an output terminal of the linear regulator
Data Source
AI summary
A supply modulator includes a linear regulator that generates an output voltage in an envelope tracking mode. A switching regulator operates with the linear regulator to generate the output voltage in the envelope tracking mode and to selectively generate the output voltage in an average power tracking mode. A single inductor multiple output converter operates selectively with the switching regulator to generate the output voltage in the average power tracking mode, operates to provide a power supply voltage to the linear regulator in the envelope tracking mode, and includes a first capacitor connected with a power supply terminal of the linear regulator and a second capacitor selectively connected with an output terminal of the linear regulator through a first switch. A main controller decides a tracking mode to be executed by the supply modulator.