Doherty Amplifier Isolation Structure for RF Coupling Control
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Solution Overview
Problem
Conventional Doherty amplifiers face challenges in maintaining the matching characteristics of singulated dies, which can lead to performance degradation due to potential interference between the input and output components.
Innovation Solution
The implementation of an isolation structure on a substrate between the input network and the output combiner in a Doherty amplifier die, which is configured to isolate the input and output components, thereby reducing RF coupling and ensuring stability and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the input network and output combiner are placed close together on the substrate to achieve compact design, then the device area is reduced, but RF coupling between input and output components increases causing performance degradation
Solution Approach 1:
An isolation structure is introduced as an intermediary element positioned between the input network and output combiner on the substrate. This isolation structure acts as a mediator that blocks or reduces RF coupling signals while allowing the input and output components to remain in close proximity, thus maintaining compact device area while eliminating the harmful RF coupling effect.
2Reliability
If conventional Doherty amplifier designs are used without isolation structures, then the device complexity is low, but stability and performance deteriorate due to interference between input and output components
Solution Approach 1:
The isolation structure serves as an intermediary component that improves stability by blocking interference between input and output components. While it does increase device complexity, the structure is designed to be integrated on the substrate without requiring additional external components, thus minimizing the complexity increase while achieving significant stability improvement.
Data Source
AI summary
A Doherty amplifier die according to some embodiments includes a substrate having a bandgap of above about 2 eV, a main amplifier, at least one peak amplifier, an input network connected to a first input of the main amplifier and to a second input of the at least one peak amplifier, an output combiner connected to a first output of the main amplifier and to a second output of the at least one peak amplifier; and an isolation structure arranged on the substrate between the input network and the output combiner. The isolation structure is configured to isolate the input network and the output combiner.