Patent ID: 9111725
Filing Date: 2015-08-18
Classification: H01J,H03H

Abstract:
1. A match system, comprising: a rod configured to sense an AC process signal; a first converter coupled to the rod and configured to receive a first AC voltage signal from the rod and to output a DC voltage magnitude signal; a second converter coupled to the rod and configured to receive a first AC current signal from the rod and to output a DC current magnitude signal; a multiplier coupled to the first and second converters and configured to receive the DC voltage and current magnitude signals and to output a DC magnitude error signal; a phase detector coupled to the rod and configured to receive a second AC voltage signal and a second AC current signal from the rod and to output a DC phase difference signal, wherein the DC phase difference signal is converted into a DC phase error signal; a RF matching network configured to receive the AC process signal; and a controller coupled to the multiplier, the phase detector, and the RF matching network and configured to receive the DC magnitude and phase error signals and to vary an impedance of the RF matching network in response to the DC magnitude and phase error signals.