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Method of controlling the switched mode ion energy distribution system

  • US 9,362,089 B2
  • Filed: 08/28/2012
  • Issued: 06/07/2016
  • Est. Priority Date: 08/29/2010
  • Status: Active Grant
First Claim
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1. A method for providing a modified periodic voltage function to an electrical node, the electrical node configured for electrically-coupling to a substrate support of a plasma processing chamber, the method comprising:

  • obtaining an effective capacitance value, C1, of the substrate support;

    storing the effective capacitance value, C1, in a memory;

    providing an ion current compensation, IC, to the electrical node;

    providing a periodic voltage function to the electrical node, the periodic voltage function being modified by the ion current compensation, IC, to form the modified periodic voltage function;

    providing the modified periodic voltage function to the electrical node, the modified periodic voltage function having pulses and a portion between the pulses;

    accessing the memory to retrieve the effective capacitance value, C1;

    determining a slope, dV0/dt, of the portion between the pulses of the modified periodic voltage function; and

    controlling a DC current source to adjust a magnitude of the ion current compensation, IC, applied to the substrate support until

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