| 摘要 |
PURPOSE: An apparatus for switching an oscillation period output is provided, which makes an output by synthesizing frequencies to prevent a phase jump when there is an error in one oscillator using one switching oscillator, when switching outputs of two oscillators. CONSTITUTION: The first and the second main oscillator part(10,20) supply a frequency to a dual time frequency supply apparatus. And an oscillation switching part(30) outputs a frequency whose phase is synchronized to the main oscillation part whose switching is requested and then outputs only a frequency of the switching oscillator part and then outputs a frequency whose phase is synchronized to the main oscillator part to switch, if a switching of the first or the second main oscillator part is requested. The oscillation switching part comprises the first and the second comparator(31,32) comparing the frequencies inputted from the first with the second main oscillator part, a switching oscillator part(33) outputting an internal oscillation frequency according to an oscillation frequency control signal, the first and the second error detector part(34,35) outputting a switch part switching control signal by detecting an error in the frequency inputted from the first and the second main oscillator part, and a switch part(36) outputting frequencies of the main oscillator parts and the switching oscillator part.
|
