AD converter, power measurement device for wideband noise using same, and power spectrum measurement device

A power spectrum measurement device for a wideband noise signal, for measuring a power spectrum of a noise signal emitted by an object to be measured, the power spectrum measurement device comprising:

• a comparator configured to compare an input voltage of an analog signal corresponding to the noise signal that has been measured to a determination voltage;
• an adjustment unit configured to shift at least one of the input voltage of the analog signal or the determination voltage;
• an encoder configured to output time-series data of one bit based on a result of the comparison obtained by the comparator;
• a processing unit configured to calculate a frequency of appearance of an output code included in the time-series data;
• and
• a control unit configured to cause the adjustment unit to operate so that the determination voltage is offset with respect to an average voltage of the noise signal,
• wherein the processing unit is configured to decompose the time-series data output from the encoder into constituent frequency components to acquire a power spectrum and to calculate the frequency of appearance of the output code included in the time-series data.