| 摘要 |
An oscillator controller has a phase frequency detector that compares a reference signal and a frequency-divided signal and outputs a phase difference signal; a charge pump; a loop filter that filters the phase error signal output from the charge pump and outputs an oscillation frequency controlling voltage; a voltage-controlled oscillator; a first counter that counts the number of waves of the reference signal to a desired number and outputs a first flag signal; a second counter that counts the number of waves of the frequency-divided signal to the desired number and outputs a second flag signal; a first comparator that compares the first flag signal and the second flag signal and outputs a frequency comparison signal; and a control circuit that controls the voltage-controlled oscillator, the first counter, the second counter and the frequency divider by outputting signals thereto.
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