| 摘要 |
PURPOSE:To provide the clock switching circuit, which can reproduce 50% of the input clock of a duty cycle without being affected by switching, concerning the clock switching circuit of a device equipped with a redundant system. CONSTITUTION:First and second transmission parts 150 and 160 are respectively equipped with first and second differentiation circuits 900 and 110 to respectively output differentiated pulses by executing differentiation when starting and stopping input clocks A, a reception part 240 is equipped with a first selection part 600 to input the differentiated pulses outputted from the first differentiation circuits of these transmission parts and to output one of them according to a switching signal B, a second selection part 190 to input the differentiated pulses outputted from the second differentiation circuits of these transmission parts and to output one of them according to the switching signal B, a flip-fop circuit 220 to output a pulse by setting/resetting according to one or the other one of the both outputs from the first and second selection parts, and the input clock is reproduced and outputted even in the case of switching according to the switching signal. |
