Patent ID: 6737852
Filing Date: 2004-05-18
Classification: G01R

Abstract:
A clock skew measuring apparatus for measuring a clock skew between a plurality of clock signals to be measured in a circuit on which a test is performed, comprising:a device under test having the circuit, comprising: a clock signal selecting element operable to receive said plurality of clock signals to be measured from the circuit, said clock signal selecting element adapted as an output of said device under test for outputting said plurality of clock signals to be measured by selecting one of said plurality of clock signals to be measured one by one; and a clock skew estimator operable to receive a reference signal input to said device under test and said plurality of clock signals to be measured output from said clock signal selecting element and to obtain said clock skew between said plurality of clock signals to be measured by measuring a timing difference between said received reference signal and each of said plurality of clock signals to be measured.