RF Power Diagnostic System with Dual-Sensor Impedance Matching
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Solution Overview
Problem
Existing RF power monitoring systems in semiconductor manufacturing require recalibration of transducer and analysis packages together, leading to maintenance challenges and inability to diagnose RF power delivery network components efficiently, as they are not designed for field replacement or integration of measurements across the impedance matching network.
Innovation Solution
Incorporating RF sensors both upstream and downstream of the impedance matching network, with memory devices for storing calibration coefficients, allowing for independent replacement and simplifying sensor design by measuring only voltage or current in a fixed impedance environment, and eliminating the need for frequency-discrimination circuitry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If transducer and analysis packages are calibrated together as a unified system, then measurement precision is improved, but ease of repair deteriorates because both packages must be recalibrated together when one is replaced
Solution Approach 1:
The system is divided into separate transducer package and analysis package components, each with independent calibration capabilities. The transducer package includes its own calibration coefficients stored in memory, allowing it to be calibrated and replaced independently from the analysis package, eliminating the need for joint recalibration while maintaining measurement precision.
2Difficulty of detecting and measuring
If frequency-discrimination circuitry is used for harmonic analysis, then measurement capability is improved, but device complexity increases
Solution Approach 1:
The patent replaces complex frequency-discrimination circuitry with a simplified approach using Fast Fourier Transform (FFT) algorithms implemented in software or firmware. The transducer package captures RF signals and transfers them to the analysis package, where digital signal processing performs harmonic analysis without requiring complex analog frequency-discrimination hardware, thereby reducing device complexity while maintaining measurement capability.
3Measurement precision
If transducer packages are specifically calibrated to work with particular analysis packages, then measurement precision is improved, but adaptability deteriorates because packages cannot be independently replaced
Solution Approach 1:
The transducer package is designed with universal calibration coefficients stored in its memory that enable it to work with any compatible analysis package. The calibration coefficients are specific to the transducer package and are transferred to the analysis package, allowing the transducer to function independently with different analysis packages without requiring specific pairing or joint calibration, thereby improving adaptability while maintaining precision.
4Difficulty of detecting and measuring
If RF sensors measure both voltage and current with phase detection, then measurement capability is improved, but device complexity increases
Solution Approach 1:
The measurement function is segmented between the transducer package and the analysis package. The transducer package measures voltage and current and performs FFT analysis to extract harmonic content, while the analysis package receives the processed data for further analysis. This segmentation allows the transducer package to use simpler circuitry while maintaining comprehensive measurement capability through distributed processing.
Data Source
AI summary
An RF power delivery diagnostic system is provided herein. The system comprises an RF power source (303), an impedance matching network (305), a plasma reactor (307) in electrical contact with the RF power source by way of the impedance matching network, a first RF sensor (309) adapted to measure at least one attribute of the RF power input to the impedance matching network, and a second RF sensor (311) adapted to measure at least one attribute of the RF power output by the impedance matching network.