| 摘要 |
A clock generator includes a digitally controlled oscillator configured to generate an output clock having a frequency depending on an input code; a phase comparison section configured to output a phase difference signal by comparing a reference phase with a phase of the output clock, the reference phase being based on an input clock and a predetermined frequency multiplication number; a low-pass filter configured to provide the input code for the digitally controlled oscillator by filtering the phase difference signal; a waveform generating section configured to generate a predetermined spread spectrum wave, the predetermined spread spectrum wave being to be added with both of the frequency multiplication number and the input code; and a detection/compensation section configured to compensate the input code so that the phase difference is reduced, the phase difference being detected from the phase difference signal. |
