Modular RF Tuning for Balanced Plasma Systems
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Summary
Problems
Current semiconductor processing systems face challenges in achieving balanced RF power distribution across multiple stations due to limited real estate, lack of station-by-station power control, and interference between low to mid frequency and high frequency RF power adjustments, leading to potential arcing and inefficient tuning.
Innovation solutions
A modular recipe-controlled calibration (MRCC) system with parallel LF/MF and HF tuning circuits, allowing independent adjustment of RF power at each station, using variable capacitors and inductors to maintain cross parallel isolation and active tuning, along with absolute encoders for capacitor position tracking and a clamshell design for easier assembly.
TRIZ Analysis
Specific contradictions:
General conflict description:
Principle concept:
If a single control box is used to split and distribute RF power to multiple stations, then the device complexity is reduced, but the ability to control RF power delivery to each station individually is lost
Why choose this principle:
The patent divides the single control box into multiple independent modular units, with each module controlling RF power to a specific station. This segmentation enables individual power control for each station while maintaining a manageable system architecture through standardized modular designs.
Principle concept:
If the real estate inside the RF power splitting module is maximized to fit all components, then the device complexity is reduced, but the risk of arcing increases due to insufficient clearance and creepage
Why choose this principle:
The patent transitions from a two-dimensional planar layout to a three-dimensional configuration by stacking circuit boards vertically and using multiple layers. This dimensional change provides sufficient clearance and creepage distances for high voltage isolation while maintaining a compact overall module size and integration.
Application Domain
Data Source
AI summary:
A modular recipe-controlled calibration (MRCC) system with parallel LF/MF and HF tuning circuits, allowing independent adjustment of RF power at each station, using variable capacitors and inductors to maintain cross parallel isolation and active tuning, along with absolute encoders for capacitor position tracking and a clamshell design for easier assembly.
Abstract
A circuit tuning radio frequency (RF) power. The circuit includes a low to mid frequency (LF/HF) tuning circuit including a variable LF/MF capacitor coupled in series with an LF/MF inductor. The LF/MF tuning circuit is coupled between ground and a common node configured to receive an RF input. The circuit includes a high frequency (HF) tuning circuit coupled in parallel to the LF/MF tuning circuit between ground and the common node. The HF tuning circuit includes a variable HF capacitor coupled in series with an HF inductor. Cross parallel isolation occurs between the LF/MF inductor of the LF/MF tuning circuit and the HF inductor of the HF tuning circuit when adjusting the variable LF/MF capacitor or variable HF capacitor.