Pulse-Width Synchronization for Multi-Level Plasma Power Matching
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Solution Overview
Problem
Current power supply systems for plasma processing, particularly in semiconductor manufacturing, face challenges in coordinating and synchronizing power generators and match networks to handle multi-level pulsed power waveforms, leading to degraded process results due to impedance mismatch and lack of state-specific control.
Innovation Solution
A synchronization signal with varying pulse durations is used to convey information about state changes in the power waveform, enabling the power generator and match network to coordinate and adjust impedance accordingly, ensuring proper synchronization and preventing oscillation between optimal tune points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single-wire signal is used to support two pulse states, then the device complexity is reduced, but the manufacturing precision and process results are degraded due to inability to support multi-level pulsing
Solution Approach 1:
The patent uses pulse width modulation where the duration of synchronization pulses encodes different state information. By varying the pulse width parameter, the system can represent multiple states (e.g., short pulse for state 1, long pulse for state 2) on a single wire, enabling multi-level pulsing control without adding physical signal lines.
Solution Approach 2:
The synchronization signal uses periodic pulses with different widths to convey state information. Each pulse cycle contains encoded information about the current power state, allowing the match network to synchronize its impedance tuning with the power generator's multi-level pulsed waveform through temporal patterns rather than multiple simultaneous signals.
2Device complexity
If the match network is tuned to a single state only, then the device complexity is reduced, but the adaptability is worsened because it cannot handle multiple power states
Solution Approach 1:
The match network implements dynamic impedance tuning by continuously adjusting its matching parameters in response to synchronization pulses. The network transitions between different tune points corresponding to different power states, enabling it to adapt to multi-level pulsed waveforms while maintaining a relatively simple hardware structure through time-varying optimization.
Solution Approach 2:
The synchronization signal provides feedback timing information to the match network, allowing it to coordinate its impedance adjustments with the power generator's state transitions. This feedback mechanism enables the match network to know when to switch between tune points without requiring complex predictive control or multiple simultaneous control signals.
3Adaptability or versatility
If the match network oscillates between optimal tune points for different states, then the adaptability is improved, but the stability is worsened leading to degraded process results
Solution Approach 1:
The match network performs preliminary impedance adjustment in anticipation of upcoming state transitions by monitoring the synchronization signal patterns. By preparing the impedance match before the power state actually changes, the network avoids oscillatory behavior and ensures smooth, stable transitions between tune points, maintaining continuous optimal matching throughout the multi-level pulsing cycle.
Data Source
AI summary
A synchronization module is configured to generate a synchronization signal for transmission to at least one of a power generator and/or at least one match network, wherein the synchronization signal is formed with pulses having varying durations, wherein a duration of a pulse in the synchronization signal conveys information about an event in a power waveform.