Patent ID: 6106660
Filing Date: 2000-08-22
Classification: H01J

Abstract:
An installation for wafer etching, comprising:an etching machine that has an upper electrode and a lower electrode, wherein a first voltage is applied to the upper electrode; anda lower electrode bias voltage generator connected to the lower electrode of the etching machine to dynamically apply a varying bias voltage to the lower electrode, wherein the lower electrode bias voltage generator further includes:a matching box connected to the lower electrode for supplying the bias voltage;a matching box controller connected to the matching box for transmitting a first signal and a second signal, wherein the first signal is sent to the matching box for adjusting the bias voltage provided by the matching box;a radio frequency generator for generating a radio frequency voltage and transmitting a third signal;a radio frequency sensor box for receiving the radio frequency voltage from the radio frequency generator and then transferring the radio frequency voltage to the matching box, and transmitting a fourth signal to the matching box controller for controlling the matching box controller; anda central processing unit for receiving the third signal from the radio frequency generator and the second signal from the matching box controller, and then transmitting a first control signal to the radio frequency generator and a second control signal to the matching box controller, wherein the first control signal is used for controlling the radio frequency voltage of the radio frequency generator and the second control signal is used for controlling the adjustment of the matching box controller.