Abstract: An apparatus for obtaining a push-pull signal is disclosed. The apparatus includes: a first amplifier coupled to a first fluctuating signal for utilizing a first gain value to amplify the first fluctuating signal and then outputting a first amplified fluctuating signal; a second amplifier coupled to a second fluctuating signal for utilizing a second gain value to amplify the second fluctuating signal and then outputting a second amplified fluctuating signal; a subtractor electrically connected to the first and second amplifiers for subtracting the second amplified fluctuating signal from the first amplified fluctuating signal to generate the push-pull signal; and a level decision unit electrically connected to the first and second amplifiers for controlling the amplitudes of signals amplified by the first and second amplifiers when the optical disc drive is switched from a first operating mode to a second operating mode.

Abstract: A method for stabilizing a driving signal when an optical disc drive switches a pick-up head between a first operating mode and a second operating mode. The driving signal is utilized for controlling operation of the optical disc drive and is generated according to a read-back signal read by the pick-up head from an optical disc. The method includes: if the pick-up head is switched between the first operating mode and the second operating mode, holding the driving signal for a predetermined period of time; and when the predetermined period of time expires, stopping holding the driving signal and allowing a normal control procedure to adjust the driving signal.