Invention Grant
US07729214B1 Method and apparatus applied in optical disc drive for obtaining push-pull signal via adjusting amplifying gain according to fluctuating signals generated from photo detector of pick-up head
失效
应用在光盘驱动器中的方法和装置，用于通过根据拾取头的光电检测器产生的波动信号调节放大增益来获得推挽信号
- Patent Title: Method and apparatus applied in optical disc drive for obtaining push-pull signal via adjusting amplifying gain according to fluctuating signals generated from photo detector of pick-up head
- Patent Title (中): 应用在光盘驱动器中的方法和装置，用于通过根据拾取头的光电检测器产生的波动信号调节放大增益来获得推挽信号
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Application No.: US11161586Application Date: 2005-08-09
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Publication No.: US07729214B1Publication Date: 2010-06-01
- Inventor: Chia-Hua Chou , Chin-Yuan Hu , Ming-Jiou Yu
- Applicant: Chia-Hua Chou , Chin-Yuan Hu , Ming-Jiou Yu
- Applicant Address: TW Hsin-Chu Hsien
- Assignee: MediaTek Inc.
- Current Assignee: MediaTek Inc.
- Current Assignee Address: TW Hsin-Chu Hsien
- Agent Winston Hsu
- Main IPC: G11B7/00
- IPC: G11B7/00
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.
Information query
IPC分类:
