Vector Combining Power Amplification for Linear and Efficient RF Output
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Solution Overview
Problem
Traditional power amplifiers face a tradeoff between linearity and efficiency, with linear amplifiers being inefficient and non-linear amplifiers causing spectral distortion, especially in wireless communication signals with high peak-to-average power ratios, and existing outphasing techniques suffer from insertion loss and bandwidth limitations.
Innovation Solution
The method of vector combining power amplification, where a time-varying complex envelope signal is decomposed into substantially constant envelope signals, amplified individually, and then re-combined to minimize non-linear distortion while maximizing efficiency, allowing for efficient amplification of complex signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If linear amplifiers are used to maintain signal linearity, then output signal quality is improved, but power efficiency deteriorates
Solution Approach 1:
The invention segments the complex modulated signal into multiple constant-envelope sub-signals (e.g., through outphasing or envelope elimination and restoration techniques). Each sub-signal is amplified separately by efficient non-linear amplifiers, and then recombined to reconstruct the original signal with minimal distortion. This segmentation allows the use of high-efficiency amplifiers while maintaining overall signal linearity.
Solution Approach 2:
The invention changes the operating parameters of the amplifiers by switching between different amplifier classes (e.g., Class C, Class E) depending on the signal segment being amplified. By dynamically adjusting the amplifier operating point and using techniques like envelope tracking or polar modulation, the system achieves both high efficiency and signal linearity.
2Use of energy by moving object
If non-linear amplifiers are used to improve power efficiency, then power efficiency is improved, but spectral distortion increases
Solution Approach 1:
The invention segments the complex modulated signal into multiple constant-envelope sub-signals (e.g., through outphasing or envelope elimination and restoration techniques). Each sub-signal is amplified separately by efficient non-linear amplifiers, and then recombined to reconstruct the original signal with minimal distortion. This segmentation allows the use of high-efficiency amplifiers while maintaining overall signal linearity.
Solution Approach 2:
The invention converts the harmful non-linearity of efficient amplifiers into a beneficial feature by using the non-linear amplifiers to amplify constant-envelope signals, which are inherently more resistant to non-linear distortion. The non-linearity that would normally cause spectral regrowth is eliminated because the modulated information is carried in the phase relationships between sub-signals rather than in amplitude variations.
3Ease of operation
If power combiners are used to combine amplified signals, then signal combining is achieved, but insertion loss increases and bandwidth is limited
Solution Approach 1:
The invention merges the amplification and combining functions into a single integrated architecture. Instead of using separate power combiners to combine outputs from multiple amplifiers, the system uses a shared amplifier core where multiple constant-envelope sub-signals are processed simultaneously and combined internally through constructive interference or vector summation. This eliminates the need for external combiners and their associated losses.
Solution Approach 2:
The invention introduces an intermediary signal processing stage (such as a vector modulator or phase rotator) that converts the constant-envelope sub-signals into a form that can be efficiently combined without requiring traditional power combiners. This intermediary transformation enables lossless or low-loss combining by operating in the voltage or current domain rather than requiring power-level combining.
4Power
If traditional power amplification methods are used, then amplification is achieved, but device size increases due to combining elements
Solution Approach 1:
The invention merges the amplification and combining functions into a single integrated architecture. Instead of using separate power combiners to combine outputs from multiple amplifiers, the system uses a shared amplifier core where multiple constant-envelope sub-signals are processed simultaneously and combined internally through constructive interference or vector summation. This eliminates the need for external combiners and their associated losses.
Solution Approach 2:
The invention creates a universal amplifier architecture that can handle multiple signal types and modulation schemes through a single integrated circuit. The shared amplifier core performs multiple functions including signal combining, power amplification, and impedance matching, eliminating the need for separate discrete components and reducing overall device footprint.
Data Source
AI summary
Methods and systems for vector combining power amplification are disclosed herein. In one embodiment, a plurality of signals is individually amplified, then summed to form a desired time-varying complex envelope signal. Phase and/or frequency characteristics of one or more of the signals are controlled to provide the desired phase, frequency, and/or amplitude characteristics of the desired time-varying complex envelope signal. In another embodiment, a time-varying complex envelope signal is decomposed into a plurality of constant envelope constituent signals. The constituent signals are amplified equally or substantially equally, and then summed to construct an amplified version of the original time-varying envelope signal. Embodiments also perform frequency up-conversion.