Doherty Power Amplifier Phase Compensation Across Wide Bandwidth
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Solution Overview
Problem
Conventional Doherty power amplifier circuits experience phase misalignment and efficiency issues due to frequency-dependent phase deviation and gain differences between main and auxiliary power amplifiers, especially at different power levels and frequencies, which conventional phase compensation methods using microstrip lines cannot effectively address.
Innovation Solution
The power amplifier circuit design includes a main amplifier circuit and an auxiliary amplifier circuit, where the power amplifiers are configured in series with specific types, such as a Class-C and Class-AB power amplifiers, and additional phase and amplitude compensation modules, like band-pass filters and phase modulation modules, to ensure phase alignment and efficient operation across varying power levels and frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional phase compensation methods using microstrip lines are used, then phase alignment can be achieved at the center frequency, but phase deviation occurs in operating bands far away from the center frequency point
Solution Approach 1:
The patent uses voltage-controlled oscillators and phase shifters that can dynamically adjust their output phases based on feedback signals, allowing the system to adapt to different frequency points and maintain phase alignment across the entire operating bandwidth rather than being fixed at a single center frequency
Solution Approach 2:
The patent implements feedback mechanisms where the output phases of the main and auxiliary power amplifiers are monitored and used to control the voltage-controlled oscillators and phase shifters, enabling automatic phase alignment compensation across varying frequency and power conditions
2Power
If main and auxiliary power amplifiers of different types are used, then power amplification can be achieved, but phase misalignment occurs at different power levels
Solution Approach 1:
The patent uses feedback signals from the output stages to control the phase shifters in real-time, ensuring that phase alignment is maintained across different power levels despite using different types of power amplifiers
Solution Approach 2:
The patent employs voltage-controlled oscillators and phase shifters whose parameters (frequency and phase) can be dynamically changed based on operating conditions, allowing the system to compensate for phase differences between different amplifier types at various power levels
3Productivity
If main and auxiliary power amplifiers operate at different gains, then individual amplifier performance can be optimized, but gain difference affects the overall power amplifier circuit performance
Solution Approach 1:
The patent implements feedback mechanisms that monitor the output of both main and auxiliary power amplifiers and use this information to adjust their operation, ensuring consistent overall performance despite individual gain differences
Solution Approach 2:
The patent uses voltage-controlled components that can dynamically adjust their parameters to compensate for gain differences between amplifiers, maintaining consistent circuit performance across varying operating conditions
Data Source
AI summary
A power amplifier circuit, a base station, a signal transceiver device, and a power amplifier apparatus are disclosed. The power amplifier circuit may include a main amplifier circuit and an auxiliary amplifier circuit connected in parallel between a signal input end and a signal output end. The main amplifier circuit may include a first power amplifier and a second power amplifier connected in series. The first power amplifier is a class-C power amplifier, and the second power amplifier is a class-AB power amplifier. The auxiliary amplifier circuit may include a third power amplifier and a fourth power amplifier connected in series. The third power amplifier is a class-AB power amplifier, and the fourth power amplifier is a class-C power amplifier.