The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 01, 2010
Filed:
Aug. 09, 2005
Chia-hua Chou, Taipei Hsien, TW;
Chin-yuan HU, Chia-I, TW;
Ming-jiou Yu, Taipei, TW;
MediaTek Inc., Hsin-Chu Hsien, TW;
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.