Patent ID: 11948775
Assignee: ASM AMERICA, INC.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 19:
20. A method of manufacturing a semiconductor, the method comprising:
a) placing a substrate in a plasma chamber configured to deposit a material layer onto the substrate or etch a material layer from the substrate;
b) operably coupling an impedance matching network between a radio frequency (RF) source and the plasma chamber, the matching network comprising an RF input configured to operably couple to the RF source, an RF output configured to operably couple to the plasma chamber, and a variable reactance element (VRE), the VRE having different positions for providing different reactances;
c) the RF source providing an RF signal to the RF input of the matching network, the RF source being subject to a power control scheme to control a power delivered to the RF input of the matching network;
d) determining a parameter related to the matching network or the plasma chamber;
e) based on the determined parameter, determining from the different positions of the VRE a new position for the VRE to reduce a reflected power at the RF input of the matching network;
f) altering the power control scheme; and
g) while the power control scheme is altered, altering the VRE to the new position.