CIRCUIT, CONTROL SYSTEM, CONTROL METHOD, AND COMPUTER-READABLE RECORDING MEDIUM IN WHICH PROGRAM IS RECORDED

摘要

A circuit able to achieve high frequency tracking performance while satisfying jitter/wander suppression performance. The circuit controls the loop gain of a PLL means (100) according to the results of processing a jitter/wander component and a frequency change state (300) based on the phase comparison data of the PLL means (100). Said PLL means (100) is a means for reproducing an SDH (Synchronous Digital Hierarchy) signal or Ethernet signal from an OTN (Optical Transport Network) signal.