Patent ID: 7948734
Filing Date: 2011-05-24
Classification: H01L,Y10T

Abstract:
1. A power supply for an electrostatic chuck, comprising: a signal generating circuit configured to generate a square wave signal; an amplifying circuit electrically connected to the signal generating circuit configured to amplify the square wave signal; a transformer having a primary winding and a secondary winding, the primary winding electrically connected to the amplifying circuit, and the secondary winding configured to be electrically connected to said electrostatic chuck, the secondary winding producing a signal for said electrostatic chuck; and a voltage divider circuit electrically connected to the secondary winding and further connected to the amplifying circuit, the voltage divider circuit configured to reduce the voltage of the signal for the electrostatic chuck and feed back the reduced voltage signal to the amplifying circuit, wherein the signal from the secondary winding is a trapezoidal waveform with approximately flat tops and minimal dead-time between phase reversals.