Envelope Tracker Buck Control for RF Power Amplifier Supply
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Solution Overview
Problem
Current power amplifier systems in mobile devices face inefficiencies in managing RF signal amplification, leading to high power consumption and interference, particularly in managing the power level of RF signals over time, which existing envelope tracking methods do not adequately address.
Innovation Solution
The implementation of a mobile device with a power amplifier, a buck converter, and an error amplifier that converts battery voltage into a buck voltage and adjusts the power amplifier supply voltage based on the RF signal envelope, using a buck converter and error amplifier to control the buck voltage and current, thereby optimizing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a power amplifier is used to amplify RF signals in mobile devices, then the RF signal transmission capability is improved, but the power consumption increases
Solution Approach 1:
The patent implements dynamic supply voltage adjustment for the power amplifier by introducing a supply voltage controller that modifies the power amplifier's supply voltage based on the RF signal characteristics. This dynamic adjustment allows the power amplifier to operate at optimal voltage levels for different signal conditions, reducing power consumption while maintaining necessary amplification capability.
Solution Approach 2:
The patent changes the operating parameters of the power amplifier by adjusting its supply voltage in real-time. The supply voltage controller modifies voltage parameters based on envelope detection of the RF signal, enabling the power amplifier to adapt its power consumption to the actual signal requirements rather than operating at fixed high voltage levels.
2Productivity
If the power amplifier supply voltage is increased to improve amplification efficiency, then the RF signal transmission quality is improved, but the power consumption increases
Solution Approach 1:
The patent dynamically changes the supply voltage parameter of the power amplifier based on the detected RF signal envelope. By adjusting the voltage parameter in real-time rather than maintaining a fixed high voltage, the system achieves high amplification efficiency only when needed while reducing power consumption during low-signal conditions.
Solution Approach 2:
The system transitions from static supply voltage operation to dynamic supply voltage adjustment. The supply voltage controller continuously adapts the power amplifier's operating voltage based on real-time signal conditions, enabling the system to maintain high amplification efficiency when required while minimizing power consumption during idle or low-activity periods.
3Use of energy by moving object
If envelope tracking is implemented to reduce power consumption, then the power efficiency is improved, but the device complexity increases
Solution Approach 1:
The envelope tracking system is segmented into distinct functional modules: an envelope detector that extracts signal envelope information, a supply voltage controller that processes the envelope information, and a power amplifier that executes the power adjustment. This segmentation allows each module to perform its specific function efficiently while keeping the overall system manageable and modular.
Solution Approach 2:
The supply voltage controller acts as an intermediary between the envelope detector and the power amplifier. It receives envelope information from the detector, processes this information to determine appropriate voltage adjustments, and then controls the power amplifier's supply voltage accordingly. This intermediary structure simplifies the control logic and makes the overall envelope tracking system more manageable.
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
This configuration reduces power consumption and improves the efficiency of RF signal amplification by dynamically adjusting the power amplifier supply voltage in relation to the RF signal envelope, enhancing battery life and reducing heat generation.
Implementation Method 1
The buck converter is configured to convert a battery voltage into a buck voltage, and to control a magnitude of the buck voltage based on an error current
Implementation Method 2
The error amplifier is configured to generate an output current based on an envelope of the RF input signal and to generate the power amplifier supply voltage by adjusting the magnitude of the buck voltage using the output current
Implementation Method 3
The power amplifier is configured to receive a power amplifier supply voltage and to amplify a radio frequency (RF) input signal to generate an RF output signal
Data Source
AI summary
Apparatus and methods for envelope trackers are disclosed herein. In certain configurations, a mobile device includes a power amplifier configured to amplify a radio frequency (RF) input signal to generate an RF output signal. The power amplifier is configured to receive power from a power amplifier supply voltage. The mobile device further includes a voltage converter configured to convert a battery voltage into a regulated voltage, and the voltage converter is configured to control a magnitude of the regulated voltage based on an error signal. The mobile device further includes an error amplifier configured to generate an output current based on an envelope of the RF input signal and to generate the power amplifier supply voltage by adjusting the magnitude of the regulated voltage using the output current. The error amplifier is further configured to control the error signal.