Patent ID: 9026241
Filing Date: 2015-05-05
Classification: G05B

Abstract:
1. A semiconductor manufacturing tool monitoring system, comprising: a first sensor system configured to measure one or more processing conditions of a semiconductor manufacturing tool and to generate a first monitoring response based thereupon; a second sensor system configured to measure the one or more processing conditions of the semiconductor manufacturing tool and to generate a second monitoring response based thereupon; a comparison element configured to compare the first monitoring response to the second monitoring response to identify a deviation between the first and second monitoring responses is indicative of an error in the first or second sensor systems; a control system configured to receive a warning signal from the comparison element and upon receiving the warning signal to suspend operation of the semiconductor manufacturing tool; and wherein the comparison element is configured to generate the warning signal if the first monitoring response deviates from the second monitoring response, which is measured at a substantially same time as the first monitoring response, by a value greater than a threshold value.