| 摘要 |
PURPOSE: To provide a PLL circuit capable of automatically adjusting an oscillation frequency range in the inside of an LSI. CONSTITUTION: An automatic adjustment circuit 20 in the PLL circuit detects deviation of the oscillation frequency range on the basis of voltage outputted by a phase comparator 14, the number of frequency divisions of a first frequency divider 17 and frequency information outputted from a reference oscillator 16, and adjusts the oscillation frequency range of a voltage-controlled variable oscillator 11 according to the detected deviation.
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