Envelope-Tracking Supply Rail Control for RF Amplifier Efficiency
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Solution Overview
Problem
Existing power supply circuits in mobile electronic devices are inefficient, leading to reduced battery life due to the constant supply of peak power to power amplifiers, even when the amplifiers do not operate at peak power levels.
Innovation Solution
The implementation of an envelope-tracking power supply system that dynamically controls the supply voltage to the error amplifier with a periodicity associated with a power control period, minimizing the peak supply voltage to match the amplifier's operational needs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a constant peak supply voltage is provided to the power amplifier, then the amplifier can operate at peak power levels, but power consumption increases and battery life decreases
Solution Approach 1:
The patent applies dynamics by transitioning from a static constant supply voltage to a dynamic variable supply voltage that changes over time. The envelope tracking power supply circuit dynamically adjusts the supply voltage to the power amplifier based on the instantaneous power requirements, allowing the system to adapt its power delivery to match actual operational needs rather than maintaining a fixed peak level.
Solution Approach 2:
The patent implements parameter changes by modifying the supply voltage parameter from a constant value to a time-varying value. The envelope tracking circuit changes the voltage parameter dynamically to follow the envelope of the modulated signal, enabling the power amplifier to receive appropriate voltage levels that correspond to the actual signal power requirements rather than always receiving peak voltage.
2Reliability
If a constant peak supply voltage is provided to the power amplifier, then the amplifier maintains readiness for peak output, but battery life is reduced
Solution Approach 1:
The envelope tracking power supply provides dynamic voltage adjustment that maintains amplifier readiness only when needed. By continuously monitoring and adjusting the supply voltage to match the signal envelope, the system ensures the amplifier is ready to deliver peak power when required while reducing voltage during lower power periods, thereby extending battery life without compromising operational reliability.
Solution Approach 2:
The patent maintains continuous useful action through the envelope tracking mechanism that continuously monitors the signal and provides appropriate voltage levels. This continuous adaptation ensures the amplifier remains ready for peak output when needed while avoiding unnecessary power consumption during lower power periods, effectively extending battery life while maintaining operational readiness.
3Use of energy by moving object
If dynamic envelope-tracking control is implemented, then power efficiency is improved, but device complexity increases
Solution Approach 1:
The patent introduces an intermediary envelope tracking power supply circuit between the battery and the power amplifier. This intermediary component handles the complexity of dynamic voltage control, signal envelope detection, and voltage regulation, thereby improving power efficiency while isolating the complexity from the main amplifier system and other device components.
Data Source
AI summary
The present disclosure generally relates to techniques and apparatus for implementing an envelope-tracking power supply for a radio frequency (RF) power amplifier. One aspect includes an amplification system. The amplification system may include a first amplifier configured to generate an amplifier output voltage, a second amplifier having an output coupled to a supply node for the first amplifier, a voltage regulator having an output coupled to a supply node for the second amplifier, and control circuitry configured to control the voltage regulator to generate a supply voltage at the supply node for the second amplifier based on an indication associated with the amplifier output voltage. In some aspects, the control circuitry may be configured to control the voltage regulator through at least providing an updated control setting for the voltage regulator with a periodicity associated with a power control period.