RF Power Splitter Layout for Multi-Chamber Impedance Isolation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Managing complex impedance matching and cross-talk issues in RF plasma processing tools with multiple chambers connected to a single power generator is challenging, leading to increased system complexity and reduced efficiency.
Innovation Solution
An RF power distribution system with a power splitter placed upstream of impedance matches, each chamber having its own variable impedance match, and a controller to adjust impedance based on reflected power sensors, reducing cross-talk and improving isolation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple chambers are coupled to a single power generator, then power distribution efficiency is improved, but system complexity increases
Solution Approach 1:
The patent divides the system into independent chamber modules, each with its own impedance match circuit. This segmentation allows each chamber to be controlled independently while sharing a common power generator, reducing the complexity of managing multiple chambers as a single complex system.
Solution Approach 2:
The patent implements preliminary impedance matching for each chamber before power distribution. By pre-configuring the impedance match circuits in each chamber, the system prepares for efficient power reception in advance, simplifying the overall power distribution process.
2Loss of energy
If variable impedance match is used to account for changing plasma load impedances, then power transfer efficiency is improved, but control complexity increases
Solution Approach 1:
The patent applies local impedance matching by providing a dedicated variable impedance match circuit in each chamber. This allows each chamber to independently adjust its impedance characteristics according to its specific plasma load conditions, optimizing power transfer efficiency locally without affecting other chambers.
Solution Approach 2:
Each chamber's impedance match circuit autonomously adjusts to match the plasma load impedance in that specific chamber. This self-service capability eliminates the need for centralized complex control, as each chamber independently optimizes its own power reception.
3Object-affected harmful factors
If a power splitter is placed upstream of impedance matches, then cross-talk between chambers is reduced, but voltage and current handling requirements increase
Solution Approach 1:
The patent introduces a power splitter as an intermediary component between the power generator and the impedance match circuits. This splitter acts as a mediator that distributes power to multiple chambers while providing electrical isolation, thereby reducing cross-talk between chambers.
Solution Approach 2:
The patent combines multiple chamber inputs into a single power distribution point through the power splitter. By merging the power distribution path at the splitter, the system achieves better isolation and reduced cross-talk compared to separate distribution paths.
Data Source
AI summary
Embodiments disclosed herein include an apparatus that includes a radio frequency (RF) power supply, and a power splitter electrically coupled to the RF power supply. In an embodiment, the apparatus includes a plurality of impedance matches electrically coupled to the power splitter, where the power splitter is configured to split RF power from the RF power supply in order to supply the RF power to each of the plurality of impedance matches. In an embodiment, the apparatus further includes a plurality of chambers, wherein each chamber is electrically coupled to a different one of the plurality of impedance matches.