Power Amplifier Supply Voltage Control for Envelope Peak Tracking
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Solution Overview
Problem
In electronic devices, power amplifiers often receive a supply voltage higher than their minimum operating voltage, leading to excessive power loss due to a 'dropout voltage' gap, resulting in high power consumption and inefficiency.
Innovation Solution
A method to control the supply voltage of power amplifiers by acquiring the state of the signal envelope, including rising and falling edges, and adjusting the voltage based on corresponding peak values, ensuring the supply voltage matches the actual operating voltage, thereby reducing power loss and consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed high supply voltage is provided to power amplifiers to ensure proper operation, then reliability is improved, but power loss increases due to the dropout voltage gap
Solution Approach 1:
The patent implements dynamic supply voltage adjustment by continuously monitoring the envelope signal state and modifying the DCDC converter output voltage in real-time. The supply voltage transitions from a fixed high value to a dynamically adjusted value that matches the actual operating requirements, eliminating the static dropout voltage gap while ensuring reliable power amplifier operation throughout signal variations
Solution Approach 2:
The patent employs feedback mechanisms by detecting the envelope signal state and using this information to control the DCDC converter output. The system continuously monitors signal conditions and adjusts supply voltage accordingly, creating a closed-loop control system that optimizes power delivery while preventing power loss associated with fixed voltage provisioning
2Loss of energy
If the supply voltage is reduced to match the minimum operating voltage, then power loss is reduced, but signal distortion may occur during signal peaks
Solution Approach 1:
The system dynamically adjusts supply voltage in response to envelope signal state changes, transitioning between voltage levels based on real-time signal conditions. This dynamic adaptation allows the supply voltage to match minimum operating requirements during low-signal periods while automatically increasing during peak conditions to prevent distortion, thereby maintaining both energy efficiency and signal quality
Solution Approach 2:
The patent performs preliminary detection of envelope signal state and proactively adjusts supply voltage before signal peaks occur. By anticipating signal variations through envelope detection and提前 adjusting the DCDC converter output, the system prevents power amplifier saturation and signal distortion before they can occur, ensuring signal integrity while minimizing power loss
3Device complexity
If a simple fixed voltage supply is used, then device complexity is reduced, but power consumption efficiency deteriorates
Solution Approach 1:
The patent enhances the functionality of the voltage supply circuit by integrating envelope detection and dynamic control capabilities into the existing DCDC converter architecture. The same power supply circuit performs both fixed voltage provisioning and adaptive voltage adjustment, eliminating the need for completely separate control systems while improving power consumption efficiency through intelligent modulation of the DCDC converter
Data Source
AI summary
A method for controlling a supply voltage of a power amplifier, and an electronic device are provided. The method includes acquiring a state of an envelope of a to-be-amplified signal, where the state of the envelope includes a rising edge and a falling edge; acquiring a first voltage corresponding to the envelope when the state of the envelope is the falling edge, and controlling the supply voltage of the power amplifier according to the first voltage. The method also includes acquiring a second voltage corresponding to a maximum peak value of the to-be-amplified signal in a first preset time when the state of the envelope is the rising edge, and controlling, according to the second voltage, the supply voltage of the power amplifier in the first preset time.