Semiconductor Physical Quantity Control with Dual-Stage Feedforward
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Solution Overview
Problem
Existing semiconductor manufacturing facilities face challenges in achieving fast response characteristics for physical quantity control, which is crucial for maintaining process homeostasis and improving manufacturing quality and yield.
Innovation Solution
The implementation of feedforward control technology, specifically using a method that includes first and second stage feedforward controls to accelerate and then stabilize the physical quantity control system, followed by switching to feedback control at a designated switching point.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional feedback control is used for physical quantity control, then system stability is maintained, but response speed is slow
Solution Approach 1:
The feedforward controller predicts future physical quantity values based on process recipes and historical data, and generates control signals in advance before the actual process occurs. This preliminary action allows the system to proactively adjust physical quantities rather than reactively responding to deviations, thereby achieving fast response speed while maintaining stability through the complementary feedback control mechanism.
2Speed
If feedforward control is applied to accelerate physical quantity control, then response speed improves, but control precision may deteriorate
Solution Approach 1:
The system merges feedforward control and feedback control into a unified dual-stage control architecture. The feedforward controller handles rapid response requirements by predicting and preemptively adjusting physical quantities, while the feedback controller simultaneously operates to correct deviations and ensure precision. This combination allows the system to achieve both fast response speed and high control precision by leveraging the complementary strengths of both control methods.
3Productivity
If dual-stage feedforward control is implemented, then response performance accelerates, but system complexity increases
Solution Approach 1:
The feedforward control is segmented into two distinct stages: first-stage feedforward control for rapid initial response and second-stage feedforward control for refined adjustment. This segmentation allows each stage to be optimized independently for its specific function, improving overall response performance while keeping the complexity manageable through modular design. The switching mechanism between stages is automatically triggered based on process conditions, reducing the burden on operators.
Data Source
AI summary
A method of controlling a physical quantity of a semiconductor manufacturing facility includes performing feedforward control including control of a first stage feedforward to accelerate a physical quantity control system to a physical limit performance and control of a second stage feedforward to reduce acceleration of the physical quantity control system at a first switching point, switching the feedforward control to feedback control at a second switching point, and performing feedback control on the physical quantity control system.