| 摘要 |
An A/D converter includes an adjusting circuit to adjust a total of an amount of change of &Sgr;&Dgr; modulated data output from a &Sgr;&Dgr; modulator and an amount of change of dummy data to be constant, and a level converting part supplied with the &Sgr;&Dgr; modulated data. The level converting part includes a first level converter to output the &Sgr;&Dgr; modulated data by converting a level of the &Sgr;&Dgr; modulated data, and a second level converter to receive the dummy data from the adjusting circuit and interpolate dummy noise, in order to cancel a frequency dependence of noise with respect to the &Sgr;&Dgr; modulated data.
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