| 摘要 |
PURPOSE:To decrease or evade the difference in the tracking characteristic at phase synchronizing operation and the tracking characteristic at frequency synchronizing operation by forming a PLL with a loop by a frequency comparator and a loop by a phase comparator. CONSTITUTION:The frequency comparator 11 is operated when an LKTSV signal is set, selects *INCf and *DECf signals generated from a frequency comparator 11 and supplies the 1st charge pump circuit 131. A phase comparator 12 is operated when the LKTDT signal is set, selects *INCp and *DECp signals generated from a phase comparator 12 to supply it to the 2nd charge pump circuit 132. When the output current characteristic of the 1st charge pump circuit 131 is set lower than the output current characteristic of the 2nd charge pump circuit 132, the tracking characteristic at the frequency synchronization slows down. |
