Compact Doherty Power Amplifier Topology Without λ/4 Lines
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Solution Overview
Problem
Existing power amplifying circuits face challenges in size reduction due to the need for λ/4 transmission lines, which occupy significant space.
Innovation Solution
A power amplifying circuit design incorporating a splitter, first, second, and third amplifiers, with the first and second output terminals connected and the third input terminal connected to the first input terminal, allowing for size reduction by eliminating the need for λ/4 lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If λ/4 transmission lines are installed in each amplifier, then amplification performance is improved, but circuit size increases
Solution Approach 1:
The patent merges the λ/4 transmission line function into a common structure shared by multiple amplifiers. Instead of installing separate λ/4 lines in each amplifier, a single common λ/4 transmission line is used by multiple amplifiers, thereby reducing the total circuit area while maintaining the necessary amplification performance.
Solution Approach 2:
The common λ/4 transmission line serves multiple amplifiers simultaneously, making it a universal component that performs the same function for different amplifier units. This multi-functional approach eliminates redundant components and reduces overall circuit size.
2Power
If multiple amplifiers are connected in parallel, then amplification capability is improved, but space requirement increases
Solution Approach 1:
Multiple amplifiers are connected in parallel and share common input and output terminals, merging their functions into a compact configuration. This parallel connection with shared terminals allows the circuit to achieve high amplification capability while minimizing the space required compared to separate amplifier installations.
Solution Approach 2:
The patent transitions from a distributed spatial arrangement of amplifiers to a concentrated parallel connection topology. By organizing amplifiers in a parallel configuration with shared terminals, the design achieves high power output in a two-dimensional plane without requiring proportional increases in physical space.
Data Source
AI summary
Size reduction is enabled. A power amplifying circuit includes a splitter, a first amplifier, a second amplifier, and a third amplifier. The splitter splits an input signal into a first signal and a second signal. The first amplifier has a first input terminal and a first output terminal, amplifies the first signal, and outputs a first amplified signal. The second amplifier has a second input terminal and a second output terminal, amplifies the second signal, and outputs a second amplified signal. The third amplifier has a third input terminal and a third output terminal, amplifies the first signal, and outputs a third amplified signal. The first output terminal and the second output terminal are connected to each other, the third input terminal is connected to the first input terminal, and the third output terminal is connected to the second output terminal.