| 摘要 |
PROBLEM TO BE SOLVED: To provide a phase synchronization method by which a user can easily cope with a rapid voltage fluctuation caused at application of power without the need for skill. SOLUTION: Since a limit circuit 5 provided between a voltage controlled oscillator 1 and a filter 4 selectively extracts a voltage C required by the voltage controlled oscillator 1 for frequency synchronization on the basis of a signal outputted from the filter 4 and a signal of the extracted voltage C is outputted to the voltage controlled oscillator 1, even on the occurrence of rapid voltage fluctuation caused at application of power, it can easily and surely be relaxed. Thus, no soldering work where an expert is required is needed for the adjustment after assembling unlike conventional phase synchronization circuit so as to facilitate the adjustment of the phase synchronization circuit. Furthermore, since the limit circuit 5 itself is simply configured, possibility of increasing the cost can be precluded. |
