| 摘要 |
PURPOSE:To ensure the immediate setting into the correct synchronous point even through the synchronism may get out the position due to the disturbance for the phase control loop in which the D-FF circuit is used for the subtractor circuit, by providing the frequency diciding means, the voltage comparator, the reset FF circuit and the gate circuit each in order to secure the assured setting into the steady synchronous point for the phase control loop at the power source make time. CONSTITUTION:Frequency deciding means 11 gives decision to the relation between output frequency f0 and reference frequency fS, consiting of FF circuits 11a and 11b. Voltage comparator 12 gives comparison between control voltage EV of voltage control type oscillator 4 and voltage ES of reference power source 13. And reset FF circuit 14 operates on the ''1'' level input, and gate circuit 15 gives control to the transmission of the Q output frequency of D-FF circuit 6 to phase comparator 2. |
