Doherty High-Frequency Circuit for Output Power and Efficiency
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Solution Overview
Problem
High frequency circuits face efficiency deterioration and insufficient maximum output power due to operational deviations of the second amplifier from the desired operating point.
Innovation Solution
The high frequency circuit incorporates a Doherty amplifier configuration with a carrier amplifier, a peak amplifier, and preamplifiers, along with a phase shift circuit and transformers, to manage signal power levels and impedance effectively, ensuring efficient operation across varying signal conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a second amplifier is added to amplify signals in a specific power level region, then the output power capability is improved, but the circuit complexity increases
Solution Approach 1:
The amplification process is segmented into multiple stages with different amplifiers handling different power level regions. The first amplifier handles the first signal in a first power level region, while the second amplifier handles a third signal in a second power level region. This segmentation allows each amplifier to be optimized for its specific operating region, improving overall output power capability without requiring a single complex amplifier to handle all power levels.
Solution Approach 2:
The circuit dynamically switches between different amplifier configurations based on the input signal power level. When the input signal power is below a threshold, the first amplifier operates independently. When the input signal power exceeds the threshold, the second amplifier is activated to provide additional amplification. This dynamic operation allows the circuit to adapt its complexity to the actual signal conditions, maintaining simplicity when high power amplification is not needed.
2Use of energy by moving object
If multiple amplifiers are used to handle different power levels, then the efficiency is improved, but the device complexity increases
Solution Approach 1:
The amplification function is segmented across multiple amplifiers, each optimized for specific power level regions. The first amplifier is optimized for lower power levels, while the second amplifier is optimized for higher power levels. This segmentation allows each amplifier to operate in its optimal efficiency region, improving overall energy utilization.
Solution Approach 2:
A signal separation mechanism acts as an intermediary to divide the input signal into appropriate power level regions before routing to different amplifiers. This intermediary ensures that each amplifier receives signals within its optimal operating range, maximizing efficiency while managing the complexity of having multiple amplifiers through systematic signal routing.
Data Source
AI summary
A high frequency circuit includes a signal input terminal and a signal output terminal; a first amplifier, a second amplifier, a third amplifier, and a fourth amplifier; and a first phase shift circuit. An input terminal of the fourth amplifier is connected to the signal input terminal, an output terminal of the fourth amplifier is connected to an input terminal of the first amplifier and an input terminal of the second amplifier, an output terminal of the second amplifier is connected to an input terminal of the third amplifier, an output terminal of the third amplifier is connected to one end of the first phase shift circuit, and the other end of the first phase shift circuit is connected to an output terminal of the first amplifier.