| 摘要 |
<p>A phase locked loop includes a variable frequency oscillator, a phase comparator for comparing the phase between an output signal derived prom the variable frequency oscillator and a reference signal and for generating a control signal is response to the phase difference of both of signals so as to control the variable frequency oscillator, an indicator for indicating the phase difference of both the signals, and a control circuit for varying the frequency of the variable frequency oscillator.</p> |
