Doherty Power Amplifier Common-Mode Network for Back-Off Efficiency
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Solution Overview
Problem
Existing Doherty power amplifiers are limited in efficiency improvement in the back-off region and consume excessive power when amplifying signals with high peak to average power ratio (PAPR) in wireless communication systems.
Innovation Solution
A Doherty power amplifier structure utilizing a common mode configuration that interconnects power amplifiers through a common mode network, enhancing efficiency in a wider back-off region and minimizing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a power amplifier operates in a back-off region to linearly amplify high PAPR signals, then linearity is improved, but efficiency deteriorates and power consumption increases
Solution Approach 1:
The power amplifier is divided into two separate power amplifiers: a main power amplifier that operates efficiently at lower power levels and a peak power amplifier that activates during peak signal conditions. This segmentation allows each amplifier to operate in its optimal efficiency region, maintaining overall linearity while significantly improving power efficiency compared to a single amplifier operating continuously in back-off region
Solution Approach 2:
The system dynamically switches between the main power amplifier and the peak power amplifier based on signal conditions. The main amplifier handles average power levels continuously, while the peak amplifier is activated dynamically during high PAPR events. This dynamic operation allows the system to maintain linearity during peaks while minimizing power consumption during average operation
2Use of energy by moving object
If a Doherty power amplifier is used to improve amplifier efficiency in back-off region, then efficiency is improved, but the improvement capability is limited
Solution Approach 1:
The invention changes the operational parameters of the power amplifiers by allowing the main power amplifier to operate at different bias points and power levels depending on signal conditions. The peak power amplifier is designed with specific impedance matching networks that adapt the load conditions dynamically. This parameter adaptation enables broader efficiency improvement across different back-off regions compared to fixed-parameter Doherty amplifiers
Solution Approach 2:
The main power amplifier serves multiple functions: it operates as the primary amplifier during average conditions and also provides impedance transformation for the peak amplifier during peak conditions. The peak power amplifier similarly serves both as a peak handler and contributes to overall power combining. This multi-functionality enhances the versatility and efficiency improvement capability across different operating regions
Data Source
AI summary
The disclosure relates to a 5th generation (5G) or a pre-5G communication system for supporting a higher data transmission rate after a 4th generation (4G) communication system such as long-term evolution (LTE). A Doherty power amplifier of a wireless communication system is provided. The Doherty power amplifier includes a first power amplifier, a second power amplifier, a first transmission line connected to an output end of the first power amplifier, a second transmission line connected to an input end of the second power amplifier, a first network, and a second network, the first network may interconnect a first node connected with one end of the first transmission line and a second node connected with an output end of the second power amplifier, the one end of the first transmission line may be positioned on an opposite side with respect to the output end of the first power amplifier, and the second network may connect the first node, the second node, and a third node which is an output end of the Doherty power amplifier.