Patent ID: 9741543
Date: 2017-08-22
CPC Classifications: G01R,H01J

Claim:
1. A voltage sensor configured for a voltage controlled interface of a plasma processing system, wherein the voltage sensor is configured to receive a radio frequency (RF) signal generated by a pickup device, and wherein the received RF signal is indicative of a RF voltage provided at a substrate in a plasma chamber, the voltage sensor comprising: a first divider corresponding to a first channel and having a first capacitance ratio, wherein the first divider is configured to receive the RF signal generated by the pickup device, wherein the first divider generates a first reduced voltage signal; a second divider corresponding to a second channel and having a second capacitance ratio, wherein the second divider is configured to receive the RF signal generated by the pickup device, and wherein the second divider generates a second reduced voltage signal; a first peak detector to receive the first reduced voltage; a second peak detector to receive the second reduced voltage; a first output of the first channel configured to output a first output signal to a controller based on an output of the first peak detector and while the received RF signal is in a first voltage range; and a second output of the second channel configured to output a second output signal to the controller based on the an output of the second peak detector and while the received RF signal is in a second voltage range, wherein the second voltage range is different than the first voltage range.