Master Clock Synchronization for Plasma Subsystem Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current communication protocols in plasma systems result in significant delay and variance times, making it difficult to achieve atomic layer precision during quasi-atomic layer deposition (ALD) or quasi-atomic layer etching (ALE) processes without using self-limiting reactions.
Innovation Solution
A master clock is used to synchronize control signals between subsystems of a plasma process module, with a distributed controller configuring a predefined number of clock cycles for feedback loops within the step period, allowing for precise phase and synchronization control of tool subsystems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If current communication protocol is used for controlling subsystems, then system complexity is reduced, but manufacturing precision deteriorates due to delay and variance times exceeding 1% of recipe step time
Solution Approach 1:
A dedicated communication bus acts as an intermediary channel between the controller and subsystems, providing a specialized pathway for timing-critical signals. This separates timing-sensitive communications from general-purpose data traffic, ensuring deterministic delivery without requiring complete redesign of the overall control architecture.
Solution Approach 2:
The communication system is segmented into different channels or priorities, with atomic layer control signals receiving highest priority and dedicated bandwidth. This allows critical timing signals to be transmitted with guaranteed latency bounds while less time-sensitive data uses shared resources.
2Manufacturing precision
If feedback loops are added for precise synchronization, then manufacturing precision improves, but device complexity increases
Solution Approach 1:
The system implements feedback loops that measure actual signal delivery times and subsystem responses, then dynamically adjust timing parameters to compensate for variations. This closed-loop approach achieves atomic layer precision by continuously correcting synchronization errors rather than relying solely on predetermined timing sequences.
Solution Approach 2:
The communication bus performs self-adjustment of timing parameters based on observed system behavior, reducing the need for external calibration and manual tuning. The system automatically compensates for drift and variation through embedded timing measurements and adaptive resynchronization.
Data Source
AI summary
A communications system for synchronizing control signals between subsystems coupled to a process module used for processing a substrate. A distributed controller coupled to the subsystems is configured to initiate process steps, each step having a step period. A distributed clock module includes a master clock having a clock speed including clock cycles, each clock cycle having a duration that is pre-correlated to a feedback loop within which synchronized control signals are delivered to and received from the subsystems by the distributed clock module. A predefined number of clock cycles is assigned by the distributed clock module for performing a corresponding number of feedback loops for transitioning between process steps. The predefined number of clock cycles are restricted to a fraction of the step period.