Distributed RF Power Splitting With Detuned Impedance Balancing
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Solution Overview
Problem
Distributed RF power delivery systems in semiconductor processing facilities face challenges with uneven power distribution due to variables such as wear and impedance differences, leading to excess reflected power that can damage the RF power source.
Innovation Solution
A centralized controller with RF sensors along each branch of the power delivery system adjusts impedance matches using variable capacitors to balance power distribution, minimizing reflected power through detuning operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a single RF power source distributes power to multiple plasma chambers, then power delivery efficiency is improved, but uneven power distribution occurs due to wear and impedance differences
Solution Approach 1:
The patent applies local quality by making each impedance matching network independently adjustable through variable capacitors. This allows each branch of the power distribution system to be tuned individually to compensate for local variations in wear and impedance, ensuring uniform power delivery across all plasma chambers while maintaining overall system efficiency.
2Manufacturing precision
If impedance matches are adjusted to balance power distribution, then power delivery uniformity is improved, but reflected power increases back to the RF power source
Solution Approach 1:
The patent converts the harmful reflected power into a beneficial control mechanism. By intentionally detuning the impedance matching networks, the system generates controlled reflections that interfere destructively with unwanted power variations. This transforms what would normally be harmful reflected power into a useful tool for achieving uniform power distribution while minimizing net reflections back to the source.
3Ease of operation
If RF sensors and controllers are added to balance power, then power distribution control is improved, but system complexity increases
Solution Approach 1:
The patent implements self-service by enabling the impedance matching networks to automatically adjust and balance power distribution without requiring external intervention. The variable capacitors and controllers work autonomously to detect and correct power imbalances, reducing the need for complex external monitoring and manual adjustment systems.
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 approach ensures uniform power delivery to each plasma chamber, reducing stress on the RF power source and improving efficiency by minimizing reflected power.
Implementation Method 1
changing a reflection coefficient for one or more of the plurality of impedance matches by altering one or more variable capacitors of the one or more of the plurality of impedance matches
Implementation Method 2
a plurality of RF sensors are configured to measure a voltage and/or a current along a different one of a plurality of transmission lines
Implementation Method 3
the controller is configured to balance power that passes through the plurality of RF impedance matches with a detuning operation
Data Source
AI summary
Embodiments described herein relate to an apparatus that includes an RF power supply and an RF power splitter. In an embodiment, the RF power splitter includes a plurality of outputs, and a plurality of RF impedance matches are electrically coupled to different ones of the plurality of outputs of the RF power splitter. In an embodiment, a plurality of RF sensors are configured to measure a voltage and/or a current along a plurality of transmission lines that couple each of the plurality of outputs of the RF power splitter to a different one of the plurality of RF impedance matches. In an embodiment, the apparatus further includes a controller communicatively coupled to the plurality of RF sensors and the plurality of RF impedance matches. The controller is configured to balance power that passes through the plurality of RF impedance matches with a detuning operation.