RF Generator Pulse-Block Synchronization for Plasma Processing
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Solution Overview
Problem
Existing synchronization methods for RF generators in plasma tools rely on a single TTL signal, which fails to account for timing slips due to internal clock malfunctions, leading to inconsistent processing of substrates.
Innovation Solution
Implementing an analog synchronization signal using an Ethernet for Control Automation System (EtherCAT) train or analog signal to align the start and end of pulse blocks across multiple RF generators, correcting for timing errors caused by internal clock inaccuracies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single TTL signal is used to synchronize RF generators, then the synchronization method is simple, but timing slips occur due to internal clock malfunctions leading to inconsistent substrate processing
Solution Approach 1:
The patent segments the synchronization approach by introducing multiple independent synchronization signals (first synchronization signal and second synchronization signal) that operate in parallel. Each signal independently controls timing for different pulse blocks, eliminating the single point of failure in traditional TTL-based synchronization and preventing timing slips while maintaining processing consistency.
Solution Approach 2:
The patent implements preliminary synchronization by pre-establishing multiple synchronization signals before substrate processing begins. These signals are configured in advance to account for potential internal clock malfunctions, ensuring that timing alignment is already in place before processing starts, thereby preventing timing slips rather than correcting them during operation.
2Reliability
If multiple synchronization signals are implemented to prevent timing slips, then substrate processing consistency is improved, but system complexity increases
Solution Approach 1:
The patent introduces an intermediary synchronization control mechanism that manages multiple synchronization signals through a unified interface. This intermediary layer coordinates the first and second synchronization signals, allowing them to operate independently for different pulse blocks while maintaining overall system coherence, thus improving reliability without proportionally increasing complexity.
Solution Approach 2:
The patent applies periodic action by using repetition of pulse block patterns synchronized to periodic synchronization signals. The first and second synchronization signals operate in repeating cycles that align with pulse block sequences, allowing the system to maintain consistent timing alignment across multiple processing cycles without requiring complex continuous control mechanisms.
Data Source
AI summary
Systems and methods for synchronization of radio frequency (RF) generators are described. One of the methods includes receiving, by a first RF generator, a first recipe set, which includes information regarding a first plurality of pulse blocks for operating the first RF generator. The method further includes receiving, by a second RF generator, a second recipe set, which includes information regarding a second plurality of pulse blocks for operating a second RF generator. Upon receiving a digital pulsed signal, the method includes executing the first recipe set and executing the second recipe set. The method further includes outputting a first one of the pulse blocks of the first plurality based on the first recipe set in synchronization with a synchronization signal. The method includes outputting a first one of the pulse blocks of the second plurality based on the second recipe set in synchronization with the synchronization signal.