Patent ID: 6254738
Filing Date: 2001-07-03
Classification: H01F,H01J,H03H

Abstract:
A semiconductor fabrication system for depositing material onto a substrate, the system comprising:a semiconductor fabrication chamber having a plasma generation area within said chamber;a plasma generation coil positioned to couple RF energy into said plasma generation area to generate a plasma, said plasma generation coil having a plurality of voltage values distributed along said plasma generation coil; anda voltage distribution controller having a first variable inductor which has a first variable inductance, said voltage distribution controller being coupled to said plasma generation coil and adapted to shift said voltage value distribution in a predetermined path along said plasma generation coil as a function of said first variable inductance of said first variable inductor wherein said first variable inductor includes a first inductor coil having a central axis and a first rotating core adapted to rotate about a rotational axis which is nonparallel to said first inductor coil central axis to provide said first variable inductance which varies as a function of the position of said first core as said first core rotates.