RF Generator Arbitrary Waveform Control
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Solution Overview
Problem
Conventional RF generators in plasma semiconductor manufacturing processes have limited waveform options for pulsed RF signals, restricting the control over etch and deposition profiles, and require external signal generators for pulsing techniques.
Innovation Solution
An RF generator system that allows for the generation of pulsed RF signals with arbitrary, multi-step, or single-step pulses of any shape, using a modulating signal with arbitrary waveforms, which can be created and loaded onto the system, enabling precise control over pulse characteristics and power levels through digital or analog feedback loops.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If external signal generators are used for pulsing techniques, then waveform options are limited, but device complexity increases
Solution Approach 1:
The patent combines the RF generator and pulse generator into a single integrated device. The RF generator includes an internal pulse generator that can generate various pulse waveforms (single-step, multi-step, arbitrary waveforms) without requiring external signal generators. This merging eliminates the need for separate external equipment while providing extensive waveform options through programmable control.
Solution Approach 2:
The RF generator is designed to perform multiple functions: it can generate continuous RF signals, pulsed RF signals with various pulse widths, and complex arbitrary waveforms. The single device replaces what previously required multiple separate instruments (RF generator plus external pulse generator), providing universal capability for different plasma processing requirements.
2Manufacturing precision
If conventional RF generators are used, then control over etch and deposition profiles is restricted, but manufacturing precision is limited
Solution Approach 1:
The patent implements dynamic control of RF power delivery through programmable pulse width modulation and arbitrary waveform generation. The system can dynamically adjust pulse width, duty cycle, and waveform shape to precisely control plasma chemistry and physics during etch and deposition processes, enabling fine-tuned control over profile formation that static conventional generators cannot achieve.
Solution Approach 2:
The system enables precise control by allowing independent adjustment of multiple parameters including pulse width, duty cycle, peak power, and arbitrary waveform characteristics. These parameter changes directly influence plasma properties such as ion flux, radical density, and sheath voltage, providing precise control over etch rate, selectivity, and deposition conformality.
3Ease of operation
If external connectors are used for pulsing, then ease of operation is reduced, but device complexity increases
Solution Approach 1:
The patent extracts the pulse generation functionality from external equipment and embeds it within the RF generator itself. By removing the need for external signal generators and their connectors, the system simplifies the operational workflow. Users can program and control all pulse parameters directly through the RF generator's interface, eliminating the complexity of coordinating multiple external devices.
Data Source
AI summary
Radio frequency (RF) generators are disclosed. A RF generator may include a modulator configured to output a pulsed RF signal by modulating an RF carrier using a pulsed analog signal as a modulating signal. The modulating signal may be based on a file. The file may be received via a communication interface. The RF generator may further include an amplification stage configured to amplify the pulsed RF signal output by the modulator. RF generation systems and methods of generating a pulsed RF signal also disclosed.