Vector Combining RF Power Amplifier for Linearity and Efficiency
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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 producing spectrally distorted output signals, especially in wireless communication systems, 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 recombined 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 traditional linear power amplifiers are used to maintain signal linearity, then output signal quality is improved, but power efficiency deteriorates
Solution Approach 1:
The patent segments the amplification process into multiple parallel paths (e.g., in-phase and quadrature components), each handling constant envelope signals that can be amplified efficiently. By dividing the complex signal into separable components that can be processed independently and then recombined, the system achieves both high efficiency and linearity without requiring a traditional linear amplifier.
2Use of energy by moving object
If traditional non-linear power amplifiers are used to improve power efficiency, then power consumption is reduced, but output signal linearity deteriorates causing spectral distortion
Solution Approach 1:
The patent segments the amplification process into multiple parallel paths (e.g., in-phase and quadrature components), each handling constant envelope signals that can be amplified efficiently. By dividing the complex signal into separable components that can be processed independently and then recombined, the system achieves both high efficiency and linearity without requiring a traditional linear amplifier.
Solution Approach 2:
The patent merges multiple efficiently amplified constant envelope signals (in-phase and quadrature components) to reconstruct the original complex signal. By combining these segmented signals after efficient amplification, the system recovers the desired linearity while maintaining the power efficiency benefits of non-linear amplification in each branch.
3Ease of operation
If existing outphasing techniques use power combiners to combine constant envelope constituents, then signal combination is achieved, but insertion loss increases and bandwidth is limited
Solution Approach 1:
The patent extracts the signal combination function from traditional power combiners and implements it through direct summation of voltage signals in parallel circuits. By removing the combiner component entirely and using direct signal addition through parallel impedance matching, the system eliminates insertion loss and bandwidth limitations associated with combiner devices.
4Ease of operation
If existing outphasing techniques use combining elements to merge signal constituents, then signal combination is achieved, but device size increases preventing monolithic integration
Solution Approach 1:
The patent extracts the signal combination function from traditional power combiners and implements it through direct summation of voltage signals in parallel circuits. By removing the combiner component entirely and using direct signal addition through parallel impedance matching, the system eliminates insertion loss and bandwidth limitations associated with combiner devices.
Solution Approach 2:
The patent merges multiple efficiently amplified constant envelope signals (in-phase and quadrature components) to reconstruct the original complex signal. By combining these segmented signals after efficient amplification, the system recovers the desired linearity while maintaining the power efficiency benefits of non-linear amplification in each branch.
Data Source
AI summary
Methods and systems for vector combining power amplification are disclosed herein. In one embodiment, a plurality of signals are 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.