| 摘要 |
PURPOSE:To quickly lead in the phase with respect to each of many burst input signals by driving a circuit with a control signal synchronized with the burst input signal and a burst selecting signal. CONSTITUTION:A phase detector 3 detects the phase of a burst input signal 1 passing a phase shifter 2, and the output signal of the detector 3 is inputted to a switch 6a. The switch 6a is controlled by the control signal synchronized with the signal 1 and the output signal of an AND gate 9a of a burst designating signal 11a. An automatic phase control loop is closed only for the designated signal 1, and the final value of the phase error voltage of the signal 1 designated at the preceding time is applied to a low-pass filter 4a while the designated signal 1 does not exist. Thus, a stepwise voltage change does not occur in the input signal of the filter 4a and the phase is quickly led in with respect to each of many signals 1. |
