METHOD AND APPARATUS FOR REDUCING PHASE ERROR IN REMOTE CLOCK

摘要

PROBLEM TO BE SOLVED: To provide a method capable of reducing phase errors in a remote clock synchronized with a reference clock when feedback control cannot be performed temporarily.

SOLUTION: The method comprises an open loop controller and an operation history database. The open loop controller synchronizes a remote clock with a reference clock when communication cannot be conducted between the clocks. The operation history database collects a continuous operation history for the remote clock in a state that a closed loop controller is under feedback control. When communication between clocks is stopped, the remote clock is controlled by an approximate control voltage based on past operation history data stored in the operation history database.

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