Patent ID: 6509542
Filing Date: 2003-01-21
Classification: H01J

Abstract:
A plasma reactor system for use in the processing and manufacture of a workpiece, the plasma reactor system comprising:a plasma chamber for containing a plasma therein and having an interior configured for support and plasma processing of the workpiece; a workpiece support electrode disposed at least partially within said plasma chamber; at least one variable power source supplying an electrical signal to said electrode, wherein an output of said variable power source is coupled directly to said electrode; and a feedback circuit including: a summing circuit, wherein a set-point control signal is coupled to a first input of said summing circuit, and wherein an output of said summing circuit is coupled to a control input of said variable power source; and a sensor circuit for sensing at least one parameter related to said plasma and generating an error signal corresponding to deviations in said parameter, wherein an input of said sensor circuit is coupled directly to said electrode, and wherein said error signal is coupled to a second input of said summing circuit and wherein the sensor circuit includes a balancing circuit.