Balanced Doherty Amplifier Input Splitting for Phase-Matched Efficiency
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Solution Overview
Problem
The efficiency of balanced Doherty power amplifier circuits is reduced due to mismatched time delays, phases, and working statuses between the peak and main amplifiers, as they receive the same input signal, leading to suboptimal performance and reduced output power.
Innovation Solution
The implementation of separate input signals for the peak and main amplifiers within the balanced Doherty power amplifier circuit, utilizing a digital signal processing module to match and optimize their operations, thereby adjusting time delays and phases for improved efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the same input signal is provided to both peak amplifier and main amplifier, then the circuit structure is simple, but the time delays and phases of the two amplifiers cannot precisely match, reducing efficiency
Solution Approach 1:
The patent divides the input signal processing into two separate paths: one for the peak amplifier and one for the main amplifier. Each path has its own signal processing chain, allowing independent adjustment of time delays and phases. This segmentation enables precise matching of the two amplifiers' working statuses while maintaining a manageable circuit structure through modular design.
2Loss of energy
If separate input signals are provided to peak amplifier and main amplifier, then time delays and phases can be precisely matched, but the circuit structure becomes more complex
Solution Approach 1:
The patent introduces separate signal processing paths as intermediary elements between the common input signal and the two amplifiers. These intermediary paths include adjustable time delay and phase shift components that act as mediators to synchronize the peak and main amplifiers. This approach achieves precise matching without requiring complete redesign of the entire circuit architecture.
3Ease of manufacture
If the peak amplifier and main amplifier operate with mismatched phases, then the circuit is easier to implement, but the output power and efficiency are reduced
Solution Approach 1:
The patent employs adjustable time delay and phase shift parameters in the separate signal processing paths for the peak and main amplifiers. By independently tuning these parameters, the system achieves precise phase and timing alignment between the two amplifiers, maximizing output power and efficiency. This parameter adjustment capability maintains implementation simplicity through standardized components with variable settings.
Data Source
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AI summary
The present invention discloses a balanced Doherty power amplifier circuit and a radio transmitter, and relates to the field of wireless communication technologies, increasing efficiency of a power amplifier circuit. The balanced Doherty power amplifier 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; 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 by using a one-fourth wavelength line; 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 by using a one-fourth wavelength line.