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Supervisory control of radio frequency (RF) impedance tuning operation

  • US 9,876,476 B2
  • Filed: 08/18/2015
  • Issued: 01/23/2018
  • Est. Priority Date: 08/18/2015
  • Status: Active Grant
First Claim
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1. A radio frequency (RF) control system comprising:

  • a RF generator including a power amplifier that outputs a RF signal having an adjustable target frequency, the RF generator also including a controller, the controller varying the frequency of the RF signal; and

    a matching network receiving the RF signal, the matching network including at least one impedance tuning element, the impedance tuning element being adjustable in accordance with commands communicated from the controller,wherein in a first mode of operation when the RF signal is at a first target frequency, the controller enables adjustment of both the frequency of the RF signal about the target frequency and the tuning element to vary an impedance match and in a second mode of operation, when the RF signal is adjusting to a second target frequency, the controller inhibits adjustment of the frequency of the RF signal about the target frequency to vary an impedance match and enables adjustment of the impedance tuning element to vary an impedance match.

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