Multi-channel RF Generator Module for Plasma Chamber Coordination
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Solution Overview
Problem
Existing RF generator systems for plasma chambers require multiple identical generators to handle larger surface areas, increasing complexity and cost, while lacking efficient coordination of RF outputs in multi-channel systems.
Innovation Solution
A multi-channel RF generator module that includes power amplifiers, drivers, a power supply module, and a control module to generate and coordinate multiple RF outputs, ensuring equal frequency, phase, and magnitude, reducing component count and improving reliability by integrating a matching module and feedback control for impedance matching and power management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple identical RF generators are employed to service larger surface areas, then the plasma chamber can treat larger areas, but the system complexity and cost increase
Solution Approach 1:
The patent combines multiple RF output channels into a single integrated RF generator unit. The generator includes multiple power amplifiers that produce multiple RF outputs, along with a matching module that coordinates impedance matching for all channels, and a control module that manages all RF outputs centrally. This merging approach allows the system to service larger plasma chamber surface areas while reducing the number of separate generator units needed, thereby decreasing system complexity and interconnections.
2Area of stationary object
If multiple identical RF generators are employed to service larger surface areas, then the plasma chamber can treat larger areas, but the cost increases
Solution Approach 1:
The patent consolidates multiple RF generator functions into a single unit, reducing the total component count including power amplifiers, matching modules, and control circuits. By sharing common components such as the power supply, control module, and housing structure across multiple RF channels, the system achieves cost effectiveness while maintaining the capability to treat larger surface areas through coordinated multi-channel RF output.
3Adaptability or versatility
If multiple identical RF generators are employed, then RF outputs can be generated for multiple plasma electrodes, but coordination of frequency, phase, and magnitude becomes difficult
Solution Approach 1:
The patent implements a matching module that centrally coordinates impedance matching for multiple RF output channels, ensuring consistent frequency, phase, and magnitude across all channels. The control module provides unified management of all power amplifiers, enabling precise coordination of RF parameters while maintaining identical output characteristics across channels, thereby achieving both adaptability and reliability.
Solution Approach 2:
The matching module incorporates feedback mechanisms to monitor and adjust the RF output parameters across multiple channels. By continuously monitoring the RF signals and adjusting the matching networks accordingly, the system maintains consistent frequency, phase, and magnitude relationships between channels, ensuring reliable and coordinated operation of multiple plasma electrodes.
Data Source
AI summary
A multi-channel radio frequency (RF) generator module includes N power amplifiers, M drivers, a power supply module, and a control module. The N power amplifiers generate N RF outputs, respectively. The M drivers drive the N power amplifiers based on M driver control signals, respectively. The power supply module receives alternating current (AC) input power and applies L rail voltages to the N power amplifiers based on L rail voltage setpoints, respectively. The control module sets the L rail voltage setpoints and the M driver control signals. N is an integer greater than one, L and M are integers greater than zero, and M and L are less than or equal to N.