Generator Source Impedance Control via Variable Isolation Port
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Solution Overview
Problem
Plasma processing systems face instability due to variations in plasma impedance, affecting power delivery and process variables like etch or deposition rates, which existing impedance matching and control mechanisms struggle to manage effectively.
Innovation Solution
A method and system that adjust the source impedance of a generator by using a controllable variable impedance component in a four-port combiner, allowing for dynamic modification of the generator's source impedance to align with changing plasma impedance, thereby stabilizing power delivery and improving process control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If impedance matching and control mechanisms are used to maintain power delivery, then power delivery stability is improved, but device complexity increases
Solution Approach 1:
The patent changes the impedance parameter dynamically by adjusting the termination impedance at the isolation port based on detected plasma impedance variations. This allows the system to adapt to changing plasma conditions without requiring complex impedance matching networks, resolving the contradiction between reliability and device complexity.
2Adaptability or versatility
If the generator source impedance is fixed, then device complexity is reduced, but adaptability to varying plasma impedance deteriorates
Solution Approach 1:
The patent introduces a controllable impedance component at the isolation port as an intermediary element. This component acts as a mediator that adjusts the effective source impedance seen by the plasma load, enabling adaptability without modifying the generator's internal structure and thus maintaining simplicity while improving adaptability.
3Use of energy by moving object
If high efficiency generator design is used, then energy efficiency is improved, but source impedance control capability deteriorates
Solution Approach 1:
The patent segments the impedance control function from the power generation function. The high efficiency generator maintains its optimized design for energy efficiency, while the impedance adaptation function is separated and implemented as an external controllable impedance component at the isolation port. This segmentation allows both high energy efficiency and source impedance adaptability to coexist.
Data Source
AI summary
Systems and methods for adjusting the source impedance of a generator are disclosed. An exemplary method includes generating a first signal and applying the first signal to a first input of a combiner, generating a second signal and applying the second signal to a second input of said combiner, and combining the first and second signals with the combiner at an output of the combiner to produce power that is delivered to the plasma load. A controllable variable impedance is provided to an isolation port of the combiner, and the controllable variable impedance is adjusted to vary the source impedance of the generator.