Patent ID: 9698783
Date: 2017-07-04
CPC Classifications: H01L,H03F,H03K

Claim:
1. A charged particle beam apparatus for measuring a wafer based on secondary electrons generated by irradiating an electron beam to the wafer, the charged particle beam apparatus comprising: a differential input circuit that amplifies a differential input signal; a level shift circuit that shifts the voltage of the signal amplified by the differential input circuit; and an output circuit that amplifies and outputs the signal whose voltage is shifted by the level shift circuit, wherein: the level shift circuit and the output circuit are divided by using three or more chips; different voltages are applied to substrates of the three or more chips; a deviation control of the electron beam is performed with the signal amplified by the output circuit; the three or more chips include a first chip as a high voltage-applied chip, a second chip as an intermediate voltage-applied chip, and a third chip as a low voltage-applied chip; an applied voltage to the first chip is set at V the output voltage from the output circuit has a maximum value of ±2V