Transformer-Coupled Doherty Amplifier Layout for Smaller RF Circuits
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Solution Overview
Problem
Existing Doherty amplification circuits face challenges in reducing circuit scale while maintaining high efficiency, particularly due to the parallel connection of carrier and peak amplifiers, which restricts the disposition and increases the integrated circuit size.
Innovation Solution
The proposed Doherty amplification circuit incorporates a carrier amplifier, peak amplifiers, phase shift circuits, and transformers, where the carrier amplifier's output is coupled with the peak amplifier's input through a transformer, allowing for a series connection that reduces the need for parallel disposition and increases design flexibility, thereby minimizing circuit scale.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If carrier amplifier and peak amplifier are connected in parallel, then high efficiency is achieved, but circuit scale increases and disposition is restricted
Solution Approach 1:
The patent merges the carrier amplifier and peak amplifier into a series connection configuration where the output of the carrier amplifier is coupled with the input of the peak amplifier through a transformer. This combining approach maintains the high efficiency benefits of both amplifiers operating in their respective modes while reducing the overall circuit scale by eliminating the need for parallel disposition, thus resolving the contradiction between efficiency and circuit area.
2Loss of energy
If carrier amplifier and peak amplifier are connected in parallel, then high efficiency is achieved, but disposition flexibility is restricted
Solution Approach 1:
By merging the amplifiers in series connection through transformer coupling, the patent enables greater disposition flexibility while maintaining efficiency. The series configuration allows the amplifiers to be arranged in a more compact and adaptable manner on the integrated circuit, freeing them from the rigid parallel disposition constraints while preserving their high efficiency operating characteristics.
3Loss of energy
If multi-stage amplification is implemented, then high efficiency is achieved, but circuit complexity increases
Solution Approach 1:
The patent combines multiple amplification stages into a unified series connection architecture where the carrier amplifier and peak amplifier work sequentially rather than in parallel. This merging reduces circuit complexity by eliminating redundant parallel pathways and associated control logic, while maintaining the high efficiency benefits of multi-stage amplification through the transformer-coupled series configuration.
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 configuration achieves higher efficiency and reduces the overall circuit scale compared to traditional multi-stage amplification circuits, enabling more flexible amplifier placement and improved performance.
Implementation Method 1
a first transformer including an input terminal connected to an output end of the first carrier amplifier
Data Source
AI summary
A Doherty amplification circuit includes a carrier amplifier, a peak amplifier, a phase shift circuit, a phase shift circuit connected to an output end of the peak amplifier, a transformer including an input terminal connected to an output end of the carrier amplifier, and output terminals, and a transformer including input terminals, which are respectively connected to the output terminals of the transformer, and an output terminal connected to an antenna connection terminal, in which the phase shift circuit is connected between the output terminal of the transformer and the input terminal of the transformer, and the peak amplifier and the phase shift circuit are connected between the output terminal of the transformer and the input terminal of the transformer.