In-Situ RF Power Calibration for Plasma Process Generators
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Solution Overview
Problem
The existing RF power generator calibration process is time-consuming and labor-intensive due to the need to disconnect and reconnect the connection line for power measurement, which increases the risk of equipment damage and inefficiency.
Innovation Solution
A novel RF power measurement device that allows for in-situ calibration by using a magnetic field sensor to measure RF power without disconnecting the connection line, coupled with an analysis device and feedback loop to adjust power levels automatically, optimizing the calibration process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the connection line is disconnected and reconnected to a separate power calibration loop for RF power generator calibration, then power calibration can be performed, but the process becomes time-consuming and labor-intensive
Solution Approach 1:
The patent introduces a current sensor as an intermediary device that can measure RF power in-situ without requiring disconnection of the connection line. The sensor acts as a mediator between the RF power generator and the measurement system, enabling continuous calibration while the connection line remains connected to the plasma processing chamber.
Solution Approach 2:
The patent replaces the mechanical disconnection/reconnection process with a non-contact or minimal-contact sensing approach. Instead of physically disconnecting the connection line to perform calibration, the system uses electromagnetic sensing (current sensor) to measure RF power, substituting mechanical operations with field-based measurement.
2Measurement precision
If the connection line is disconnected and reconnected for power calibration, then power calibration can be performed, but the risk of equipment damage increases
Solution Approach 1:
The current sensor serves as a protective intermediary that enables measurement without direct manipulation of the connection line. By introducing this sensing intermediary, the system avoids the harmful effects of repeated disconnection and reconnection, thereby protecting the equipment from potential damage while maintaining calibration accuracy.
Solution Approach 2:
The system performs self-calibration through the current sensor that continuously monitors RF power output. The RF power generator can automatically adjust its output based on feedback from the sensor, enabling self-service calibration without requiring external intervention or disconnection of the connection line, thus improving equipment reliability.
3Measurement precision
If manual disconnection and reconnection is used for calibration, then power calibration can be performed, but labor intensity increases
Solution Approach 1:
The calibration system performs self-calibration automatically using the current sensor to monitor RF power output. The system can automatically adjust power levels and perform calibration routines without requiring manual disconnection, reconnection, or intervention, thereby dramatically improving ease of operation while maintaining measurement precision.
Solution Approach 2:
The current sensor provides real-time feedback on RF power output to the control system. This feedback mechanism enables automatic closed-loop calibration where the system continuously monitors power levels and makes adjustments as needed, eliminating the need for manual calibration operations and improving ease of use.
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 method reduces calibration time, decreases equipment damage risk, and improves power matching accuracy by eliminating the need for physical disconnection, enabling efficient and precise power adjustment.
Implementation Method 1
A novel RF power measurement device that allows for in-situ calibration by using a magnetic field sensor to measure RF power without disconnecting the connection line
Data Source
AI summary
The present disclosure is directed to an in situ closed-loop radio frequency (RF) power management on RF processes such as a plasma etch process, a plasma chemical vapor deposition process, a plasma physical vapor deposition process, a plasma clean process, or the like. An RF power measurement device according to one or more embodiments of the present disclosure assists the in situ closed-loop RF power management on RF processes. In some embodiments, the RF power measurement device includes a coil-shaped current sensor that is wound around the path between an RF generator and a chamber. The coil-shaped current sensor senses the current flowing through this path so that the power of the RF generator may be calibrated without having to separate the RF generator for separate analysis and calibration. The RF power measurement device allows management of RF power in an in situ closed-loop manner.