Hybrid Doherty Outphasing Amplifier with Integrated Chireix Compensation
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Solution Overview
Problem
Next-generation cellular communication systems require base stations to operate across multiple frequency bands and standards with high average efficiency, which is challenging due to the limitations of existing high-efficiency amplifier implementations, particularly in handling signals with high peak-to-average power ratios (PAPR) and maintaining efficiency over a wide frequency range.
Innovation Solution
The proposed amplifying device combines Doherty and outphasing amplifiers with class E matching networks and Chireix compensating elements integrated within packaged amplifying units, reducing the need for long transmission lines and allowing inverted Doherty operation, thereby improving bandwidth and efficiency under back-off conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If Doherty power amplifiers are used for high power operation, then efficiency at power back-off is improved, but performance for signals with high PAPR deteriorates
Solution Approach 1:
The patent combines Doherty and outphasing amplifier architectures into a hybrid configuration. The Doherty section handles high power operation with load modulation, while the outphasing section handles high PAPR signals through vector summation of multiple amplifier paths, achieving both efficiency and high PAPR performance simultaneously
2Loss of energy
If outphasing amplifiers are used for large power back-off, then efficiency at back-off is improved, but bandwidth performance deteriorates
Solution Approach 1:
The patent segments the amplifier into multiple independent packaged amplifying units, each with its own matching network. This segmentation allows each unit to operate optimally across different frequency ranges, and the combined output achieves broader bandwidth while maintaining the efficiency benefits of outphasing operation
3Loss of energy
If Chireix compensating elements are used for outphasing operation, then efficiency under back-off conditions is improved, but device complexity increases
Solution Approach 1:
The patent merges the Chireix compensating elements directly into the packaged amplifying units, integrating them with the amplifiers and matching networks. This integration reduces the number of discrete components and simplifies the overall device structure while maintaining the efficiency benefits of outphasing operation
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 enhances the bandwidth and efficiency of the amplifying device, particularly in the outphasing mode, while maintaining high efficiency in Doherty mode, by using class E matching networks and absorbing Chireix compensating elements within the packaged units, reducing the number of transmission lines and ensuring proper load modulation.
Implementation Method 1
each respective matching network being a class E matching network
Implementation Method 2
the first and second Chireix compensating elements being absorbed in the matching network for the amplifiers of the second and third packaged amplifying units, respectively
Data Source
AI summary
The present invention relates to an amplifying device and to an amplifying system comprising the same. According to the present invention, an amplifier line-up is presented comprising four amplifying units which is operable in a Doherty mode and an outphasing mode. By integration of Chireix compensating elements in the matching networks used in the amplifying units a bandwidth improvement can be obtained.