Method and apparatus applied in optical disc drive for...

Details Method and apparatus applied in optical disc drive for... Method and apparatus applied in optical disc drive for...

2005-08-09

2010-06-01

Chow, Lixi (Department: 2627)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S053450, C369S044350

Reexamination Certificate

active

07729214

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.

REFERENCES:
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patent: 6754157 (2004-06-01), Osada
patent: 6785207 (2004-08-01), Nishimura et al.
patent: 7061845 (2006-06-01), Maegawa
patent: 7197001 (2007-03-01), Hsu
patent: 2003/0128641 (2003-07-01), Maegawa et al.
patent: 2004/0196767 (2004-10-01), Sameshima
patent: 2005/0117503 (2005-06-01), Yanagawa et al.
patent: 2005/0147016 (2005-07-01), Morikawa et al.
patent: WO 03075264 (2003-09-01), None

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