US Patent 7342523 Testing apparatus

To provide a testing apparatus having a function of testing a D/A converter and so forth with a reduced testing time. The testing apparatus tests a converter having functionality of converting an input signal and outputting the signal thus converted. The testing apparatus comprises: a pattern generator which generates an input signal having a predetermined cycle; a clock generator which generates a measurement clock having a predetermined cycle; a measurement unit which receives the measurement clock, and sequentially measures the values of the output signal, synchronously with the measurement clock; and a storage unit which stores, at different corresponding addresses, the values thus sequentially measured by the measurement unit.