Balanced Doherty Amplifier Synchronization for Higher Efficiency
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Solution Overview
Problem
The efficiency of existing balanced Doherty power amplifier circuits is reduced due to mismatched time delays, phases, and working statuses between the peak and mean amplifiers, which affects the overall performance and power output.
Innovation Solution
The implementation of a balanced Doherty power amplifier circuit where peak and mean amplifiers receive different input signals, allowing for separate processing and optimization through a digital domain signal processing module to match and synchronize their operations, thereby enhancing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If peak and mean amplifiers use the same input signal and traditional Doherty configuration, then the circuit structure is simple, but the time delays and phases between amplifiers cannot precisely match, reducing overall efficiency
Solution Approach 1:
The patent divides the single input signal path into two separate input signal paths, allowing independent control and optimization of peak and mean amplifiers. Each amplifier receives its own processed signal, enabling precise matching of time delays and phases without compromising the overall circuit simplicity.
Solution Approach 2:
The patent introduces digital domain signal processing to dynamically adjust parameters such as time delay and phase for each input signal path. This allows precise control over the operating parameters of peak and mean amplifiers, optimizing their synchronization and overall efficiency.
2Device complexity
If peak and mean amplifiers receive the same input signal, then the signal processing is simple, but the working statuses of two branches cannot precisely match, reducing efficiency
Solution Approach 1:
The patent segments the signal processing into two independent digital domain paths, allowing separate optimization of peak and mean amplifier working statuses. Each path can be independently tuned to achieve precise matching of time delays and phases.
Solution Approach 2:
The patent implements feedback mechanisms in the digital domain to monitor and adjust the working statuses of peak and mean amplifiers. This ensures precise matching of their operating conditions, optimizing overall efficiency while maintaining manageable signal processing complexity.
3Ease of manufacture
If traditional Doherty configuration with single input is used, then the circuit is easier to implement, but the overall power output and efficiency are compromised
Solution Approach 1:
The patent transitions from a single-dimensional input signal approach to a multi-dimensional approach by introducing separate input paths with independent digital processing. This dimensional expansion enables optimized power output while maintaining practical implementability through modular architecture.
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 approach increases the efficiency of the power amplifier circuit by optimizing the peak and mean amplifier operations, ensuring consistent performance and improved power output without compromising linear performance.
Implementation Method 1
an impedance transformation function of the one-fourth wavelength line, a load corresponding to the mean amplifier M is 100 ohms
Data Source
AI summary
A balanced Doherty power amplifier circuit and a radio transmitter is provided. The circuit includes a first peak amplifier, where an input end of the first peak amplifier is connected to a first input end of the circuit, and a first mean amplifier, where an input end of the first mean amplifier is connected to a second input end of the circuit, and an output end of the first mean amplifier is connected to an input end of a first matching unit. The circuit also includes a second peak amplifier, where an input end of the second peak amplifier is connected to the first input end of the circuit; and a second mean amplifier, where an input end of the second mean amplifier is connected to the second input end of the circuit, and an output end of the second mean amplifier is connected to an input end of the second matching unit.