| 摘要 |
There is provided a test apparatus including a PLL circuit for generating a strobe signal of which the timing is shifted according to a given delay control voltage, a variable delay circuit being provided divergently from a path connecting the PLL circuit and the timing comparator and delaying the strobe signal according to the predetermined phase difference of the strobe signal for the output signal, and a first phase comparing unit for comparing a phase of the strobe signal output from the variable delay circuit and a phase of the output signal output from the device under test and supplying the delay control voltage according to the phase difference to the PLL circuit.
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