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1.发明授权Method and apparatus for protecting magnetoresistive heads from electrostatic discharge 有权用于保护磁阻头免受静电放电的方法和装置公开(公告)号：US07502207B2
公开(公告)日：2009-03-10
申请号：US11099214
申请日：2005-04-05
CPC分类号： G11B5/40
摘要： An apparatus and method for providing electrostatic discharge protection for a disc drive read head. A pair of depletion mode MOSFETS, and a fuse associated with each are disposed between the read head output terminals. The MOSFETS are controlled to an “off” state for testing the preamplifier prior to assembly of the read head. After assembly of the head, a second pair of MOSFETS is gated to an “on” state to open the fuses and thus permit normal operation of the read head.
摘要翻译： 一种用于为盘驱动读头提供静电放电保护的装置和方法。 一对耗尽型MOSFETS和与之相关联的熔丝设置在读出头输出端子之间。 在组装读取头之前，将MOSFETS控制为“关闭”状态以测试前置放大器。 在头部组装之后，第二对MOSFETS被选通到“导通”状态以打开保险丝，从而允许读取头的正常操作。
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公开(公告)号：US06813110B2
公开(公告)日：2004-11-02
申请号：US10219948
申请日：2002-08-15
申请人： John D. Leighton , Scott M. O'Brien , Robert J. Wimmer , Nameeta Krenz , Carl F. Elliott , Michael J. O'Brien , Cameron C. Rabe
发明人： John D. Leighton , Scott M. O'Brien , Robert J. Wimmer , Nameeta Krenz , Carl F. Elliott , Michael J. O'Brien , Cameron C. Rabe
IPC分类号： G11B502
摘要： A write driver circuit selectively provides write current through a write head in first and second opposite directions. First and second active devices are driven with first and second pre-drive signals. Third and fourth active devices are driven with third and fourth pre-drive signals. First and second pull-up resistances are provided respectively between the first and second active devices and a fixed voltage, and third and fourth pull-up resistances are provided respectively between the third and fourth active devices and the fixed voltage. A first capacitor is connected between the first active device and an intermediate point of the third pull-up resistance, and a second capacitor is connected between the second active device and an intermediate point of the fourth pull-up resistance.
摘要翻译： 写入驱动器电路在第一和第二相反方向上选择性地提供写入电流通过写入头。 第一和第二有源器件由第一和第二预驱动信号驱动。 第三和第四有源器件由第三和第四预驱动信号驱动。 分别在第一和第二有源器件之间提供第一和第二上拉电阻和固定电压，并且在第三和第四有源器件之间分别提供第三和第四上拉电阻和固定电压。 第一电容器连接在第一有源器件和第三上拉电阻的中间点之间，第二电容器连接在第二有源器件与第四上拉电阻的中间点之间。
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公开(公告)号：US06879456B2
公开(公告)日：2005-04-12
申请号：US10219940
申请日：2002-08-15
申请人： John D. Leighton , Scott M. O'Brien , Robert J. Wimmer , Nameeta Krenz , Carl F. Elliott , Michael J. O'Brien , Cameron C. Rabe
发明人： John D. Leighton , Scott M. O'Brien , Robert J. Wimmer , Nameeta Krenz , Carl F. Elliott , Michael J. O'Brien , Cameron C. Rabe
摘要： A write driver circuit selectively provides a write current through a write head in first and second opposite directions. The write driver circuit is connected to the write head through an interconnect. The write driver circuit provides an incident write current signal through the interconnect to the write head, and also provides a reflection cancellation signal through the interconnect to the write head. In an exemplary embodiment, the incident write current signal is provided by providing an incident voltage signal across the write head, and the reflection cancellation signal is provided by providing a reflection cancellation voltage signal across the write head. In an exemplary embodiment, the reflection cancellation signal is a delayed and filtered version of the incident write current signal that cancels a reflected signal that is reflected at the interface between the interconnect and the write head due to impedance mismatching.
摘要翻译： 写入驱动器电路在第一和第二相反方向上选择性地提供写入电流通过写入头。 写驱动电路通过互连连接到写头。 写驱动器电路通过互连提供写入电流信号到写头，并且还通过互连提供到写头的反射消除信号。 在示例性实施例中，通过在写入头上提供入射电压信号来提供入射写入电流信号，并且通过在写入头上提供反射消除电压信号来提供反射消除信号。 在示例性实施例中，反射消除信号是入射写入电流信号的延迟和滤波版本，其消除由于阻抗失配而在互连和写入头之间的接口处反射的反射信号。
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公开(公告)号：US06493161B1
公开(公告)日：2002-12-10
申请号：US09476016
申请日：1999-12-31
IPC分类号： G11B509
CPC分类号： G11B5/09
摘要： A pulse-mode data writing protocol is disclosed which reduces the time required to implement a transition in the direction of magnetization of a recording medium, and which reduces the total power required to encode a given data sequence. After a magnetic transition is encoded on the medium by generating a write current pulse through the write head, the write current through the recording head is reduced, thereby utilizing the spatial extent of the write bubble to encode the lack of a transition on the medium. Alternate configurations are disclosed for various scenarios of write bubble size versus maximum cell size, all utilizing the principle of the invention.
摘要翻译： 公开了一种脉冲模式数据写入协议，其减少了在记录介质的磁化方向上实现转换所需的时间，并减少了编码给定数据序列所需的总功率。 通过在写入头上产生写入电流脉冲对介质上的磁转换进行编码之后，通过记录头的写入电流减小，从而利用写入气泡的空间范围来对介质上的转换进行编码。 公开了针对写入气泡尺寸与最大单元尺寸的各种情况的替代配置，所有这些都利用了本发明的原理。
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公开(公告)号：US07411756B2
公开(公告)日：2008-08-12
申请号：US11052008
申请日：2005-02-04
CPC分类号： G11B5/465 , G11B5/012 , G11B2005/0008 , G11B2005/0013 , G11B2005/0016
摘要： An apparatus and method for demagnetizing a write head of a disc drive. Under control of a clock oscillator, synthetic demagnetizing pulses are generated and applied to a writer-driver bridge. Also under control of the clock oscillator, a write current produced by the writer-driver bridge incorporates the demagnetizing pulses and ramps down to about zero. The train of demagnetizing pulses and the write current ramp down demagnetizes the head, reducing write head magnetic bias that may influence the proximate read head of the disc drive head.
摘要翻译： 一种用于使磁盘驱动器的写入磁头消磁的装置和方法。 在时钟振荡器的控制下，产生合成去磁脉冲并将其应用于写入器 - 驱动器桥。 同样在时钟振荡器的控制下，由写入器 - 驱动器桥产生的写入电流包含消磁脉冲并且下降到大约零。 消磁脉冲串和写入电流斜坡降低磁头去磁，减少可能影响磁盘驱动器磁头的近似读取磁头的写头磁偏置。
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公开(公告)号：US06785071B2
公开(公告)日：2004-08-31
申请号：US10115303
申请日：2002-04-03
申请人： Carl F. Elliott , John D. Leighton
发明人： Carl F. Elliott , John D. Leighton
IPC分类号： G11B502
CPC分类号： G11B20/10194 , G11B5/012 , G11B5/035 , G11B5/09 , G11B20/10009 , G11B2005/001
摘要： A disk driver writer precompensation system modulates the write current waveform based on a pattern of data bits magnetically recorded on a medium in order to adjust the timing of magnetic transitions recorded on the medium.
摘要翻译： 磁盘驱动器写入器预补偿系统基于磁记录在介质上的数据位的模式来调制写入电流波形，以便调节记录在介质上的磁转变的定时。
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公开(公告)号：US06621648B2
公开(公告)日：2003-09-16
申请号：US09845365
申请日：2001-04-30
IPC分类号： G11B509
CPC分类号： G11B20/10194 , G11B5/012 , G11B5/09 , G11B20/10009
摘要： A plurality of data bits are magnetically recorded on a medium (such as a magnetic disk in a disk drive system) by creating a write bubble region encroaching on the medium. The write bubble region has a magnetic polarity that is reversed in a pattern that corresponds to the values of the data bits being recorded on the medium. The timing of the reversing of the magnetic polarity of the write bubble region is adjusted by a precompensation system to ensure that the recorded data bits are evenly spaced on the medium. The timing adjustment is made by the precompensation system based on a state of at least one data bit previously recorded on the medium and on a state of at least one data bit to be subsequently recorded on the medium.
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8.发明授权Systems and methods for providing stacked writer leads for magnetic transducers 有权用于为磁换能器提供堆叠式写入器引线的系统和方法公开(公告)号：US08693141B1
公开(公告)日：2014-04-08
申请号：US13291766
申请日：2011-11-08
申请人： Carl F. Elliott , Zhigang Bai , Tao Pan
发明人： Carl F. Elliott , Zhigang Bai , Tao Pan
IPC分类号： G11B5/48
CPC分类号： G11B5/4853 , G11B5/17
摘要： Systems and methods for providing stacked writer leads for magnetic transducers used in disk drives are provided. One such system for providing stacked writer leads for a magnetic transducer includes a writer coil for the magnetic transducer, a first pad on the magnetic transducer, a second pad on the magnetic transducer, a first circuit trace coupled to the first pad and a first terminal of the writer coil, and a second circuit trace coupled to the second pad and a second terminal of the writer coil, where a preselected length of the first circuit trace and the second circuit trace is configured in a stacked configuration where each of the preselected lengths of the first circuit trace and the second circuit trace is positioned at about the same location in spaced apart planes.
摘要翻译： 提供了用于为磁盘驱动器中使用的磁换能器提供堆叠写入引线的系统和方法。 一种用于提供用于磁换能器的堆叠写入器引线的这种系统包括用于磁换能器的写入器线圈，磁换能器上的第一焊盘，磁换能器上的第二焊盘，耦合到第一焊盘的第一电路迹线和第一端 以及耦合到第二焊盘的第二电路迹线和写入器线圈的第二端子，其中第一电路迹线和第二电路迹线的预选长度被配置为堆叠配置，其中每个预选长度 并且第二电路迹线位于间隔开的平面中的大致相同的位置处。
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公开(公告)号：US07345839B2
公开(公告)日：2008-03-18
申请号：US10867239
申请日：2004-06-14
CPC分类号： G11B20/10027 , G11B5/09 , G11B20/10009 , G11B20/10046 , G11B20/10425
摘要： A disc drive system, such as a magnetic or optical recording and/or playback system, for low-data rate applications implements one or more circuit operations, such as read signal detection and related servo functions, as software-based digital signal processing steps in a dedicated software-based processor. The drive system incorporates increased buffering, modified input sample processing techniques, multiplexing of processing functions, and modified automatic gain control techniques to allow circuit operations to be performed with software-based digital signal processing techniques.
摘要翻译： 用于低数据速率应用的诸如磁或光记录和/或播放系统的盘驱动系统实现一个或多个电路操作，例如读信号检测和相关的伺服功能，作为基于软件的数字信号处理步骤 专用的基于软件的处理器。 驱动系统包括增加的缓冲，修改的输入采样处理技术，处理功能的多路复用和修改的自动增益控制技术，以允许使用基于软件的数字信号处理技术执行电路操作。
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公开(公告)号：US07167330B2
公开(公告)日：2007-01-23
申请号：US11100162
申请日：2005-04-06
申请人： Carl F. Elliott , Hao Fang , Ross S. Wilson
发明人： Carl F. Elliott , Hao Fang , Ross S. Wilson
IPC分类号： G11B5/03
CPC分类号： G11B20/1403 , G11B5/012 , G11B20/00086 , G11B20/0021 , G11B20/00579 , G11B20/10009 , G11B20/10425 , G11B2020/10898 , G11B2220/2516
摘要： A recording system stores recording cycle information identifying the parameters for recording user data on a particular data sector. During a subsequent operation, the recording system employs the recording cycle information to select a different set of parameters for recording new user data at the particular data sector. One of the parameters might identify a recorded pattern in a balance pad at the data sector, and another one of the parameters might identify a scrambler seed value. By employing a different set of recording parameters for each occurrence of recording user data at the particular sector, sample timing of, for example, a read channel might be based on an average of easy and hard transitions.
摘要翻译： 记录系统存储识别用于在特定数据扇区上记录用户数据的参数的记录周期信息。 在随后的操作期间，记录系统采用记录周期信息来选择用于在特定数据扇区记录新用户数据的不同参数集合。 参数中的一个可以识别数据扇区中的平衡衬垫中的记录模式，另一个参数可以识别加扰器种子值。 通过对特定扇区的记录用户数据的每次出现采用不同的记录参数集合，例如读通道的采样定时可以基于简单和硬转换的平均值。
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