Patent ID: 7668051
Filing Date: 2010-02-23
Classification: G11B

Abstract:
1. An apparatus for detecting an oscillation of a servo controller of an optical disk, comprising: an oscillation detector, electrically coupled to the servo controller of the optical disk, configured to receive an error signal associated with the servo controller and compare an amplitude, a width and a period of the error signal with a reference amplitude, a reference width and reference period to determine if an oscillation is present in the error signal, wherein the oscillation detector is further configured to: set a first flag and activate a first detecting signal if it is determined that the amplitude of the error signal is greater than the reference amplitude; compare a width of the first detecting signal to the reference width and set a second flag if it is determined that the width of the first detecting signal is greater than the reference width; and measure a time interval between the first detecting signal and a second detecting signal and set a third flag if the time interval between the first and second detecting signals is greater than the reference period, wherein an oscillation is present if the first, second and third flags are all set.