Patent ID: 7342523
Filing Date: 2008-03-11
Classification: H03M

Abstract:
1. A testing apparatus which tests a converter having functionality of converting an input signal and outputting the signal thus converted, said testing apparatus comprising: a clock generator which generates a measurement clock having a predetermined cycle; a pattern generator which generates said input signal inputted to the converter having approximately the same cycle as that of said measurement clock; a measurement unit which receives said measurement clock, and sequentially measures values of said signal outputted from said converter, synchronously with said measurement clock; a storage unit which stores, at different corresponding address, the values thus sequentially measured by said measurement unit; and a phase difference detection unit which detects the phase difference between the pulse of said input signal and the pulse of said measurement clock corresponding to said input signal pulse for each pulse, wherein, in the event that the phase difference between the pulse of said input signal and the pulse of said measurement clock is greater than a predetermined value, said storage unit does not store the value of said outputted signal measured by said measurement unit according to this particular pulse of said measurement clock.