Patent ID: 9157934
Filing Date: 2015-10-13
Classification: G01R

Abstract:
1. A test apparatus for testing a device under test, comprising: a low-speed comparator; a high-speed comparator that is operable faster than the low-speed comparator; and a switching section that switches, according to a signal output from the device under test, which one of the low-speed comparator and the high-speed comparator is used to measure a signal under measurement output from the device under test; wherein the high-speed comparator is operable to convert, into a binary or multi-valued signal, a signal under measurement that has a higher frequency than a maximum frequency of a signal under measurement that be converted by the low-speed comparator; and wherein the low-speed comparator is operable to convert, into a binary or multi-valued signal, a signal under measurement that has a larger amplitude than a maximum amplitude of a signal under measurement that be converted by the high-speed comparator.