Circuit for adjusting the impedance of a plasma section to a high-frequency generator
First Claim
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1. A device for a steadily burning plasma comprising a high frequency generator designed for a load of approximately fifty Ohms and having a frequency of approximately 13.56 MHz;
- a plasma chamber (3) comprising a first electrode (7) and a sound electrode (4);
a matching circuit (2) connecting said first and second electrodes (7,4) with said high frequency generator (1);
said matching circuit (2) including two parallel resonant circuits (12, 13;
9,
10) coupled with a first fixed capacitance (11) and having capacitive input and output connections with second and third fixed capacitances (14,
8), respectively;
said parallel resonant circuits (12, 13;
9,
10) being placed on one side of a ground connection, the two parallel resonance circuits (12, 13;
9,
10) each including a fixed inductor and a variable shunt capacitor, the parallel resonance circuit (12,
13) on the generator side having an inductance of 750 nH and a variable capacitance of 10 pF to 500 pF, and the load-side resonance circuit (9,
10) having an inductance of 500 nH and a variable capacitance of 10 pF to 500 pF, said two parallel resonant circuits (12, 13;
9,
10) being connected with one of their sides to ground and being placed in a cooling device.
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Abstract
A circuit for adjusting the impedance of a plasma section to a high-frequency generator wherein three capacitors are connected in series between the high-frequency generator and an electrode of the plasma section; located between the generator and the electrode are two parallel oscillatory circuits.
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Citations
5 Claims
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1. A device for a steadily burning plasma comprising a high frequency generator designed for a load of approximately fifty Ohms and having a frequency of approximately 13.56 MHz;
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a plasma chamber (3) comprising a first electrode (7) and a sound electrode (4); a matching circuit (2) connecting said first and second electrodes (7,4) with said high frequency generator (1);
said matching circuit (2) including two parallel resonant circuits (12, 13;
9,
10) coupled with a first fixed capacitance (11) and having capacitive input and output connections with second and third fixed capacitances (14,
8), respectively;said parallel resonant circuits (12, 13;
9,
10) being placed on one side of a ground connection, the two parallel resonance circuits (12, 13;
9,
10) each including a fixed inductor and a variable shunt capacitor, the parallel resonance circuit (12,
13) on the generator side having an inductance of 750 nH and a variable capacitance of 10 pF to 500 pF, and the load-side resonance circuit (9,
10) having an inductance of 500 nH and a variable capacitance of 10 pF to 500 pF, said two parallel resonant circuits (12, 13;
9,
10) being connected with one of their sides to ground and being placed in a cooling device. - View Dependent Claims (2, 3, 4, 5)
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Specification