Doherty Power Amplifier Layout With Impedance Compensation
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Solution Overview
Problem
Existing power amplifiers face challenges in maintaining high efficiency and linearity, especially in high-power back-off ranges, due to limitations in back-off efficiency, linearity, and layout area, which complicates design and reduces application range.
Innovation Solution
A power amplification circuit design incorporating a power distribution device, carrier amplification device, and multiple peak amplification devices with impedance compensation, allowing for flexible impedance matching and reduced PCB layout area, thereby improving efficiency and simplifying the structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If existing Doherty technology is used to increase power amplifier efficiency, then power amplification efficiency is improved, but back-off efficiency deteriorates
Solution Approach 1:
The power amplifier is divided into multiple parallel amplification units, each handling different power ranges. The main amplification unit operates at high efficiency for normal power levels, while peak amplification units activate during high-power peaks, resolving the contradiction between overall efficiency and back-off efficiency by segmenting the amplification function across multiple specialized units.
2Use of energy by moving object
If existing Doherty technology is used to increase power amplifier efficiency, then power amplification efficiency is improved, but linearity deteriorates
Solution Approach 1:
Different amplification units are designed with different operational characteristics optimized for their specific function. The main unit maintains high linearity for continuous operation, while peak units are optimized for efficiency during brief high-power events. This local optimization of quality attributes resolves the contradiction between overall efficiency and linearity preservation.
3Use of energy by moving object
If existing Doherty technology is used to increase power amplifier efficiency, then power amplification efficiency is improved, but layout area deteriorates
Solution Approach 1:
Multiple amplification units share common components including power distribution networks, impedance compensation circuits, and combining structures. This merging of shared resources reduces the total layout area compared to having completely separate amplification stages, while still maintaining the efficiency benefits of multiple units operating in parallel.
4Use of energy by moving object
If existing Doherty technology is used to increase power amplifier efficiency, then power amplification efficiency is improved, but device complexity deteriorates
Solution Approach 1:
The impedance compensation device and power distribution network serve multiple functions simultaneously: they provide impedance matching for efficiency, enable power combining for output power, and facilitate modular integration for ease of design. This multi-functionality reduces the need for separate dedicated components, thereby reducing overall device complexity while maintaining efficiency improvements.
Data Source
AI summary
Disclosed are a power amplification circuit and a power amplifier. The power amplification circuit may include: a power distribution device, a carrier amplification device, and a plurality of peak amplification devices; the power distribution device is configured for dividing an input power to obtain a plurality of divided powers, and the plurality of divided powers are respectively output to input ends of the carrier amplification device and the peak amplification devices; a first combining point is arranged at an output end of a first peak amplification device, and an output end of a second peak amplification device is connected to the first combining point by a first impedance compensation device; and a second combining point is arranged at an output end of the carrier amplification device, and the first combining point is connected to the second combining point by a second impedance compensation device.