| 摘要 |
PURPOSE:To perform frequency hopping in a wide range by providing a corresponding PLL oscillator and a control part which sends out a setting signal to set the frequency of the oscillator and a selection signal to issue output by switching the PLL oscillator at a hopping frequency oscillation part. CONSTITUTION:The control part 2 reads out frequency data displayed in clock RCK, and sends out the setting signal Fn to the hopping frequency oscillation part 3 and the selection signal SEL to the corresponding PLL oscillator judging from frequency data Fx. As the hopping frequency oscillation part 3, the one in which a large number of PLL oscillators are compounded is used, and they charge in each oscillation frequency, and a time to set the frequency(setting of frequency division ratio of variable frequency divider) of the PLL oscillator is deviated from that to switch the output of the oscillator. In other words, the output of the oscillator is switched and outputted as the output of the hopping frequency oscillation part 3 at a time when frequency setting is performed and the frequency of the PLL oscillator arrives at a stationary frequency. In such a way, it is possible to widen the variable range of the frequency. |
