| 摘要 |
<p>A frequency synthesizer which comprises a voltage controlled oscillator (15); a unit (12, 13) for outputting a value corresponding to a differential phase of a reference signal at a predetermined frequency as a first differential phase; a unit (16) for sampling an oscillating signal corresponding to an output of the voltage controlled oscillator K times per period of a repeating frequency fr (fr is an arbitrary frequency) and for repetitively generating phase information of the oscillating signal in the form of saw-tooth-like wave; a unit (17) for calculating the difference between adjacent phase information in phase information of the oscillating signal outputted as a saw-tooth-like wave, and for outputting this difference as a second differential phase; a comparator (18) for calculating the difference between the first and second differential phases; a signal processing unit (19, 20) for integrating an output of the comparator; and a unit (21) for converting an output of the signal processing unit to a voltage to control the voltage controlled oscillator. <IMAGE></p> |
