| 摘要 |
PURPOSE: To perform entire channel synchronization by providing a reference oscillation part for outputting input signals to the local oscillation circuit of a next stage, a phase synchronization part for performing phase comparison and a local oscillator for oscillating prescribed oscillation signals in the respective local oscillation circuits. CONSTITUTION: The phase synchronization part 20 performs the phase comparison of the reference oscillation signals of the reference oscillation part 10 and the oscillation signals of the local oscillator 30 and the oscillator 30 performs oscillation by the same phase as the reference oscillation signals by control signals from the synchronization part 20. That is, the oscillation is performed by a frequency corresponding to the respective local oscillation circuits 1-(n), that are respective channels, and phase synchronization is attained in the respective local oscillation circuits 1-(n) in a PLL. Thus, the reference oscillation signals of the entire local oscillation circuits 1-(n), that are the entire channels, are turned to be the same. Also, since the circuits 1-(n) of all the channels can perform synchronization when the reference signal oscillation part of one of the local oscillation circuits 1-(n) is normally operated, even when the reference signal oscillator of a certain circuit 1-(n) fails, transmission and reception are stably performed. |
