| 摘要 |
<p>PURPOSE:To expand the range of a synchronizing frequency and to perform the fine adjustment of the central frequency of a synchronizing range, by connecting a coil whose inductance can be varied in series with a crystal oscillator. CONSTITUTION:The feedback circuit 7 of a differential input/output amplifier 5 is constituted by connecting a capacitor 6 in parallel with the crystal oscillator 2, and furthermore, connecting the coil 3 whose inductance can be varied in series with the above components, and connecting such connected component in parallel with a resistor 4. The ratio of phase change at the time of varying a frequency by the function of the coil 3 is reduced, and the synchronizing range can be expanded. Since the synchronizing range is expanded, it is possible to extract a clock component more exactly out of a reception data string in which jitter or wonder is generated.</p> |
