Invention Grant
US08625401B2 System and method for reducing RF emissions associated with an optical drive laser diode HFM signal
有权
用于减少与光驱激光二极管HFM信号相关的RF辐射的系统和方法
- Patent Title: System and method for reducing RF emissions associated with an optical drive laser diode HFM signal
- Patent Title (中): 用于减少与光驱激光二极管HFM信号相关的RF辐射的系统和方法
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Application No.: US11237578Application Date: 2005-09-28
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Publication No.: US08625401B2Publication Date: 2014-01-07
- Inventor: David M. Pereira
- Applicant: David M. Pereira
- Applicant Address: US TX Round Rock
- Assignee: Dell Products L.P.
- Current Assignee: Dell Products L.P.
- Current Assignee Address: US TX Round Rock
- Agency: Terrile, Cannatti, Chambers & Holland, LLP
- Agent Robert W. Holland
- Main IPC: G11B7/00
- IPC: G11B7/00
Abstract:
An optical drive laser diode drive current has a High Frequency Modulation (HFM) signal superimposed to aid optical medium readability. The HFM signal is provided by an HFM oscillator interfaced with the laser diode drive current to provide the HFM signal with a frequency from within a predetermined range. A frequency controller varies the frequency of the HFM signal over time to reduce RF emissions associated with the HFM signal. For instance, the HFM signal frequency is varied in a swept sawtooth or triangle pattern. As another example, the HFM frequency is varied with random selections of frequencies from a predetermined frequency range.
Public/Granted literature
- US20070070863A1 System and method for reducing RF emissions associated with an optical drive laser diode HFM signal Public/Granted day:2007-03-29
Information query
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