| 摘要 |
PURPOSE:To evaluate a dynamic characteristic with high accuracy by a D/A converter evaluating device of a simple constitution, by using a digital pattern by which a D/A converter executes a large amplitude variation, and also, a level of a fundamental wave component does not become high. CONSTITUTION:A digital pattern data DT applied to a D/A converter to be evaluated DUT 2 from a pattern generator 1 of a D/A converter evaluating device becomes a signal by which a composite waveform to which a fundamental waveform (sin waveform) and an inversion waveform (-sin waveform) of the fundamental waveform has been brought to a pulse amplitude modulation PAM. A level of this signal which has been brought to an analog conversion by the DUT 2 is brought to a frequency analysis by a vector analyzer 3, and a sine wave signal Fs is evaluated. Subsequently, by using a digital pattern by which the D/A converter executes a large amplitude variation, and also, a level of a fundamental wave component does not become high, a dynamic characteristic of the D/A converter for executing a high speed conversion is evaluated with high accuracy.
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