<p>In order to synchronize the phase of a clock made redundant from an input clock more accurately, a first unit branches the input clock into first and second clocks, and a second unit delivers the second clock through a first element for interrupting the impact of the first unit. A phase regulation circuit constituting the first unit synchronizes the phase of the first clock with the phase of the second clock passing a second element having operating characteristics identical to those of the first element.</p>
