Digital Predistortion Switching for Dual-Mode Power Amplifiers
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing power amplifiers face challenges in reducing nonlinear distortion while managing power consumption effectively, particularly when operating in nonlinear regions.
Innovation Solution
A power amplification system that incorporates a digital predistortion circuit and tracker circuitry to selectively apply discrete voltage levels and mathematical-expression models for predistorting input signals, optimizing between D-ET and APT modes to improve signal quality and regulate power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If digital predistortion is applied to reduce nonlinear distortion in power amplifiers operating in nonlinear regions, then signal quality is improved, but calculation load and power consumption increase
Solution Approach 1:
The patent segments the power amplifier operation into different modes (linear mode and nonlinear mode) based on operating conditions. The DPD circuit selectively applies different predistortion algorithms or disables DPD based on the detected mode, thereby reducing unnecessary calculation load and power consumption while maintaining signal quality when needed
Solution Approach 2:
The patent implements dynamic adaptation of the DPD circuit by detecting power amplifier operating modes in real-time and adjusting the predistortion algorithm accordingly. This dynamic adjustment allows the system to optimize between signal quality and power consumption by activating complex predistortion only when the PA operates in nonlinear regions
2Use of energy by moving object
If multiple discrete voltage levels are supplied to the power amplifier to improve power-added efficiency, then energy efficiency is improved, but device complexity increases
Solution Approach 1:
The tracker circuit is designed to perform multiple functions: it monitors power amplifier output, detects operating modes, controls power supply voltage switching between multiple discrete levels, and interfaces with the DPD circuit. This multi-functionality reduces the need for separate circuits and achieves high power-added efficiency without proportionally increasing overall system complexity
Solution Approach 2:
The patent changes the power supply voltage parameter of the power amplifier by supplying multiple discrete voltage levels based on detected signal conditions. This parameter adjustment enables the PA to operate at optimal efficiency points while the tracker circuit manages the complexity of voltage switching through integrated control
Data Source
AI summary
A power amplification system includes: a power amplifier, a D-ET mode and an APT mode being selectively applied to the power amplifier; tracker circuitry configured to selectively supply at least one of multiple discrete voltages as a power supply of the power amplifier in each of the D-ET mode and the APT mode; and a digital predistortion circuit configured to predistort an input signal of the power amplifier. When the D-ET mode is applied to the power amplifier, the digital predistortion circuit predistorts the input signal by using a first mathematical-expression model for digital predistortion. When the APT mode is applied to the power amplifier, the digital predistortion circuit predistorts the input signal by using a second mathematical-expression model for digital predistortion or does not predistort the input signal.