| 摘要 |
PURPOSE:To obtain an output with reduced a residual phase difference variation and a reduced jitter within a wide VCO voltage range of a voltage control oscillator. CONSTITUTION:In the phase locked loop circuit for allowing a signal of pulse width being proportional to a phase difference of an input signal and an output signal to be subjected to current amplification through a low-pass filter 12, and taking a phase lock, a collector current IC2 of a transistor TR2 is made constant by providing a constant-current load Z to the low-pass filter 12 and fixing a residual phase different amount, and the phase locked loop circuit is operated in the outside of a dead zone so that it is not affected by a set value of an output voltage of a voltage control oscillator 13. |
