Edge ramping
First Claim
1. A system comprising:
- a base RF generator for generating a first RF signal, wherein the first RF signal transitions from one state to another, the transition from one state to another of the first RF signal resulting in a change in plasma impedance;
a secondary RF generator for generating a second RF signal, wherein the second RF signal transitions from one state to another to stabilize the change in the plasma impedance;
a controller coupled to the secondary RF generator, the controller for providing parameter values to the secondary RF generator to perform edge ramping of the second RF signal when the second RF signal transitions from one state to another, wherein the edge ramping of the second RF signal is performed to modify a rate of transition of the second RF signal to be different than a rate of transition of the first RF signal.
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Accused Products
Abstract
Systems and methods for performing edge ramping are described. A system includes a base RF generator for generating a first RF signal. The first RF signal transitions from one state to another. The transition from one state to another of the first RF signal results in a change in plasma impedance. The system further includes a secondary RF generator for generating a second RF signal. The second RF signal transitions from one state to another to stabilize the change in the plasma impedance. The system includes a controller coupled to the secondary RF generator. The controller is used for providing parameter values to the secondary RF generator to perform edge ramping of the second RF signal when the second RF signal transitions from one state to another.
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Citations
23 Claims
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1. A system comprising:
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a base RF generator for generating a first RF signal, wherein the first RF signal transitions from one state to another, the transition from one state to another of the first RF signal resulting in a change in plasma impedance; a secondary RF generator for generating a second RF signal, wherein the second RF signal transitions from one state to another to stabilize the change in the plasma impedance; a controller coupled to the secondary RF generator, the controller for providing parameter values to the secondary RF generator to perform edge ramping of the second RF signal when the second RF signal transitions from one state to another, wherein the edge ramping of the second RF signal is performed to modify a rate of transition of the second RF signal to be different than a rate of transition of the first RF signal. - View Dependent Claims (2, 3)
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4. A system for reducing an effect of a change in power level of a radio frequency (RF) signal on plasma impedance, comprising:
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a primary generator including; a primary driver and amplifier for generating a primary RF signal; a primary digital signal processor (DSP) for identifying states of a digital pulsed signal, the states including a first state and a second state, the primary DSP for identifying a first primary frequency input when the digital pulsed signal is in the first state and for identifying a second primary frequency input when the digital pulsed signal is in the second state; a first primary auto frequency tuner (AFT) coupled to the primary DSP and the primary driver and amplifier, the first primary AFT for receiving the first primary frequency input from the primary DSP and tuning the primary RF signal to achieve plasma impedance corresponding to the first primary frequency input; a second primary AFT coupled to the primary DSP and the primary driver and amplifier, the second primary AFT for receiving the second primary frequency input from the primary DSP and tuning the primary RF signal to achieve plasma impedance corresponding to the second primary frequency input, the primary RF signal having a primary rate of transition from the first primary frequency input to the second primary frequency input; a secondary generator including; a secondary driver and amplifier for generating a secondary RF signal; a secondary digital signal processor (DSP) for identifying the states of the digital pulsed signal, the secondary DSP for identifying a first secondary frequency input when the digital pulsed signal is in the first state and for identifying a second secondary frequency input when the digital pulsed signal is in the second state; a first secondary AFT coupled to the secondary DSP and the secondary driver and amplifier, the first secondary AFT for receiving the first secondary frequency input from the secondary DSP and tuning the secondary RF signal to achieve plasma impedance corresponding to the first secondary frequency input; a second secondary AFT coupled to the secondary DSP and the secondary driver and amplifier, the second secondary AFT for receiving the second secondary frequency input from the secondary DSP and tuning the secondary RF signal to achieve plasma impedance corresponding to the second secondary frequency input, the secondary DSP configured to determine a secondary rate of transition from the first secondary frequency input to the second secondary frequency input, wherein the secondary rate of transition is different than the primary rate of transition. - View Dependent Claims (5, 6, 7, 8, 9, 10)
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11. A system for reducing an effect of a change in power level of a radio frequency (RF) signal on plasma impedance, comprising:
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a primary generator including; a primary driver and amplifier for generating a primary RF signal; one or more primary controllers coupled to the primary driver and amplifier, the one or more primary controllers configured to; identify states of a digital pulsed signal, the states including a first state and a second state, tune the primary RF signal to achieve plasma impedance corresponding to a first primary power input when the digital pulsed signal is in the first state; and tune the primary RF signal to achieve plasma impedance corresponding to a second primary power input when the digital pulsed signal is in the second state, the primary RF signal having a primary rate of transition from the first primary power input to the second primary power input; a secondary generator including; a secondary driver and amplifier for generating a secondary RF signal; one or more secondary controllers coupled to the secondary driver and amplifier, the one or more secondary controllers configured to; tune the secondary RF signal to achieve plasma impedance corresponding to a first secondary power input when the digital pulsed signal is in the first state; tune the secondary RF signal to achieve plasma impedance corresponding to a second secondary power input when the digital pulsed signal is in the second state; and determine a secondary rate of transition from the first secondary power input to the second secondary power input, wherein the secondary rate of transition is different than the primary rate of transition. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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18. A method for reducing an effect of a change in power level of a radio frequency (RF) signal on plasma impedance, comprising:
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identifying states of a digital pulsed signal, the states including a first state and a second state, identifying a first primary frequency input when the digital pulsed signal is in the first state; identifying a second primary frequency input when the digital pulsed signal is in the second state; tuning a primary RF signal to achieve plasma impedance corresponding to the first primary frequency input when the digital pulsed signal is in the first state; tuning the primary RF signal to achieve plasma impedance corresponding to the second primary frequency input when the digital pulsed signal is in the second state, the primary RF signal having a primary rate of transition from the first primary frequency input to the second primary frequency input; identifying a first secondary frequency input when the digital pulsed signal is in the first state; identifying a second secondary frequency input when the digital pulsed signal is in the second state; tuning a secondary RF signal to achieve plasma impedance corresponding to the first secondary frequency input when the digital pulsed signal is in the first state; tuning the secondary RF signal to achieve plasma impedance corresponding to the second secondary frequency input when the digital pulsed signal is in the second state, determining a secondary rate of transition from the first secondary frequency input to the second secondary frequency input, wherein the secondary rate of transition is different than the primary rate of transition. - View Dependent Claims (19, 20, 21, 22, 23)
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Specification