Patent ID: 6526355
Filing Date: 2003-02-25
Classification: G01N,H01J

Abstract:
A plasma processing device, comprising:a plasma processing chamber; a gas source; a plasma power source; a computer connected to the plasma processing device, comprising: a first CPU; a CPU bus connected to the first CPU; a first board connected to the CPU bus, comprising at least one controllable connection between the CPU bus and the gas source and the plasma power source, wherein the first board further comprises: a first input port connected to the first spectrometer; a state machine connected to the first input port; an adder connected to the state machine; dual port memory connected between the adder and the CPU bus; a control register connected to the CPU bus, state machine, and the adder; an analog input connected to the control register and the CPU bus; a digital input connected to the control register and the CPU bus; and wherein the at least one controllable connection, comprises: an analog output connected to the control register and the CPU bus; a digital output connected to the control register and the CPU bus; and a stepper control connected to the control register and the CPU bus; a first spectrometer connected to the first board; a plurality of safety switches electrically connected to the digital input; a gas on/off controller electrically connected to the digital output; an RF generator controller electrically connected to the analog output; a pressure transducer electrically connected to the analog input; and a capacitor controller electrically connected to the stepper control.