Three-Path Doherty Amplifier Circuit for Modulated-Wave Gain
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Solution Overview
Problem
Existing Doherty amplifier circuits face challenges in improving the gain of modulated waves, particularly in high-output high-frequency applications such as mobile communication base stations.
Innovation Solution
A Doherty amplifier circuit is designed with a divider that distributes the input signal into three signals, where the power of the second signal is greater than that of the third signal. This configuration includes a main amplifier and two peak amplifiers, with a combiner to output the amplified signals. The input power required to turn on the first peak amplifier is lower than that for the second peak amplifier.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a conventional Doherty amplifier circuit with equal power distribution is used, then the circuit structure is simple, but the gain of modulated wave is insufficient
Solution Approach 1:
The amplifier circuit is segmented into a main amplifier and multiple peak amplifiers (first and second peak amplifiers). The input signal is divided into multiple paths, each processed by different amplifiers with different power requirements. This segmentation allows each amplifier to operate in optimized power ranges, improving overall gain of modulated wave while maintaining manageable circuit complexity through modular architecture.
Solution Approach 2:
Different amplifiers are assigned different local qualities in terms of power consumption characteristics. The first peak amplifier is designed to turn on at a lower input power level than the second peak amplifier. This local differentiation in power characteristics allows the circuit to provide enhanced gain in specific power ranges without requiring all amplifiers to operate at full power simultaneously, thus improving modulated wave gain without proportionally increasing overall circuit complexity.
2Power
If multiple peak amplifiers with different power requirements are used, then the gain in specific power ranges is improved, but the circuit configuration becomes more complex
Solution Approach 1:
The circuit employs dynamic operation where the first peak amplifier turns on at a lower input power level and the second peak amplifier turns on at a higher input power level. This dynamic activation based on input power levels allows the circuit to adaptively optimize gain across different operating conditions. The dynamic nature of the amplifier activation reduces the need for complex static control mechanisms, thereby improving overall gain without excessive increase in configuration complexity.
Data Source
AI summary
Doherty amplifier circuit includes a divider configured to divide an input signal into a first signal to a third signal and makes power of the second signal larger than that of the third signal, a main amplifier configured to amplify the first signal and output the amplified signal as a fourth signal, a first peak amplifier configured to amplify the second signal and output the amplified signal as a fifth signal, a second peak amplifier configured to amplify the third signal and output the amplified signal as a sixth signal, and a combiner configured to combine the fourth signal, the fifth signal and the sixth signal and output the combined signal as an output signal to an output terminal. An input power of the input signal for turning on the first peak amplifier is smaller than the input power for turning on the second peak amplifier.