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1.发明授权Method to write servo on multi-channels with voltage mode data and single channel with current mode data 有权在电压模式数据和单通道与当前模式数据的多通道上写入伺服的方法公开(公告)号：US06735030B2
公开(公告)日：2004-05-11
申请号：US10071285
申请日：2001-10-29
IPC分类号： G11B509
CPC分类号： G11B5/59633 , G11B5/012 , G11B20/10009 , G11B2005/0013
摘要： A write drive circuit (40) for a hard disk drive selectively providing a current mode operation for high speed data write of a single channel, and selectively providing a voltage mode operation during a servo write operation. A central buffer has a first circuit (50) providing a current mode drive signal to a head during a single channel write operation, and a second circuit (52) providing a voltage mode drive signal for multi-channel servo write operation. The outputs of both circuits (50, 52) is provided over a common differential connection (T1) feeding a pre-driver circuit (70) adapted to drive one or many heads, as determined by head select control lines (72). The circuit provides >1.6 Gb/s data write speed in single channel write operation, and has an architecture utilizing only two signal lines for four channels.
摘要翻译： 一种用于硬盘驱动器的写入驱动电路（40），其选择性地提供用于单个通道的高速数据写入的电流模式操作，并且在伺服写入操作期间选择性地提供电压模式操作。 中央缓冲器具有在单通道写入操作期间向头提供电流模式驱动信号的第一电路（50）和为多通道伺服写操作提供电压模式驱动信号的第二电路（52）。 两个电路（50,52）的输出提供在公共差分连接（T1）上，该公共差分连接（T1）馈送适于驱动一个或多个磁头的预驱动电路（70），如由磁头选择控制线（72）确定的。 该电路在单通道写操作中提供> 1.6 Gb / s的数据写入速度，并具有仅使用两条信号线用于四个通道的架构。
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公开(公告)号：US07382560B2
公开(公告)日：2008-06-03
申请号：US10249665
申请日：2003-04-29
IPC分类号： G11B5/09
CPC分类号： G11B5/022 , G11B5/012 , G11B5/02 , G11B5/59633 , G11B20/10009 , G11B2005/0013
摘要： A circuit (40) for use in a mass data storage device (10) has first (44) second (46) current driver circuits for providing write currents to the data transducer (18). The first and second current levels are different, the second current level being lower than the first. The first current driver circuit (44) may be used to apply currents representing user data to the data transducer (18) and the second current driver circuit (46) may be used to apply currents representing servo information to the data transducer (18). In addition, the first (44) and second (46) current drivers circuits may be operated at different frequencies. The first (44) and second (46) current driver circuits additionally may share at least some circuit components (70, 72, 74-75, 64-65), and may operate at different write speeds.
摘要翻译： 用于大容量数据存储装置（10）的电路（40）具有用于向数据传感器（18）提供写入电流的第一（44）第二（46）个电流驱动器电路。 第一和第二电流水平不同，第二电流水平低于第一电流水平。 第一电流驱动器电路（44）可用于将表示用户数据的电流施加到数据传感器（18），并且第二电流驱动器电路（46）可用于将表示伺服信息的电流施加到数据传感器（18）。 此外，第一（44）和第二（46）电流驱动器电路可以以不同的频率操作。 第一（44）和第二（46）电流驱动器电路另外可以共享至少一些电路部件（70,72,74-75,64-65），并且可以以不同的写入速度工作。
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公开(公告)号：US07035027B2
公开(公告)日：2006-04-25
申请号：US09974281
申请日：2001-10-09
摘要： The present invention covers circuits to achieve high data rate writing.
摘要翻译： 本发明涵盖实现高数据速率写入的电路。
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4.发明授权Method to increase head voltage swing and to reduce the rise time of write driver 有权增加磁头电压摆幅并减少写入驱动器上升时间的方法公开(公告)号：US06879455B2
公开(公告)日：2005-04-12
申请号：US10002193
申请日：2001-10-19
CPC分类号： G11B5/022 , G11B5/02 , G11B2005/0013
摘要： A voltage-mode boosting write driver circuit (40) having a pair of voltage boosting PMOS transistor sets (44, 46) coupled to a high current H-switch (42). One set (44) of the boosting PMOS transistors correspondingly pulls output pin HY high, while the other transistor set (46) correspondingly pulls output pin HX high and the other output pin HY low thereby significantly improving the head voltage swing, and also achieving a faster slew rate. Moreover, resistors (R3, R4) of the H-switch are both matched to each other and impedance matched to a flex cable (T0) interconnection impedance, which interconnection is coupled to the thin film head, to thereby eliminate signal reflection such that the write current (Iw) settles quickly with minimum ringing to achieve a high data rate. Moreover, less power dissipation and smaller number of devices used are achieved by making use of existing transient currents of the pre-driver emitter follower stage.
摘要翻译： 具有耦合到大电流H开关（42）的一对升压PMOS晶体管组（44,46）的电压模式升压写驱动器电路（40）。 升压PMOS晶体管的一组（44）相应地将输出引脚HY拉高，而另一个晶体管组46相应地将输出引脚HX拉高，另一个输出引脚HY低，从而显着提高磁头电压摆幅，并且还实现 更快的压摆率。 此外，H开关的电阻器（R3，R4）都彼此匹配，并且阻抗匹配到柔性电缆（T0）互连阻抗，该互连耦合到薄膜头，从而消除信号反射，使得 写入电流（Iw）可以通过最小振铃快速定位，实现高数据速率。 此外，通过利用预驱动器射极跟随器级的现有瞬态电流来实现更少的功率消耗和更少数量的器件。
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5.发明授权Reference circuit for write driver circuit with programmable write current, overshoot duration and overshoot amplitude control 有权具有可编程写入电流，过冲持续时间和过冲幅度控制的写驱动电路参考电路公开(公告)号：US06798591B2
公开(公告)日：2004-09-28
申请号：US10045425
申请日：2001-10-29
IPC分类号： G11B509
CPC分类号： G11B5/02 , G11B5/012 , G11B5/022 , G11B5/5526 , G11B2005/0013
摘要： A write current circuit (40) adapted to drive a thin film write head (L0) of a mass media information storage device. The write current circuit includes a write current reference voltage circuit (42) adapted to selectively establish amplitude of a write current signal. The write current circuit further includes programming circuitry (M5-M10) driven such that several parameters of the write current waveform can be controlled, including the write current amplitude, overshoot amplitude and overshoot duration. The present invention achieves technical advantages by providing the ability to both produce an accurate write current, and also providing the ability to establish the write current waveform shape so that customers can optimize disk drive performance even when using different thin film write heads available from different suppliers.
摘要翻译： 一种用于驱动大众媒体信息存储装置的薄膜写入头（L0）的写入电路（40）。 写入电流电路包括适于选择性地建立写入电流信号的幅度的写入电流参考电压电路（42）。 写入电流电路还包括被驱动的编程电路（M5-M10），使得能够控制写入电流波形的若干参数，包括写入电流幅度，过冲幅度和过冲持续时间。 本发明通过提供产生准确写入电流的能力并且还提供建立写入电流波形形状的能力来实现技术优点，使得即使当使用从不同供应商获得的不同薄膜写入头时，客户也可以优化磁盘驱动器性能 。
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公开(公告)号：US07839589B2
公开(公告)日：2010-11-23
申请号：US10805928
申请日：2004-03-22
IPC分类号： G11B5/09
摘要： A write current circuit (300, 400) adapted to drive a thin film write head (202) of a mass media information storage device. The write current circuit (300, 400) further includes programming circuitry (311, 411) driven such that parameters of the write current waveform can be varied, including the write current overshoot amplitude and/or overshoot duration. The present invention achieves technical advantages by providing the ability to program out or adjust for system introduced asymmetries in the write current waveform.
摘要翻译： 适用于驱动大众媒体信息存储装置的薄膜写入头（202）的写入电路（300,400）。 写入电流电路（300,400）还包括被驱动的编程电路（311,411），使得可以改变写入电流波形的参数，包括写入电流过冲幅度和/或过冲持续时间。 本发明通过提供对写入电流波形中的系统引入的不对称性进行编程或调整的能力来实现技术优点。
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公开(公告)号：US20080265950A1
公开(公告)日：2008-10-30
申请号：US12102110
申请日：2008-04-14
IPC分类号： H03K3/01
CPC分类号： H03K19/01825
摘要： One embodiment of the invention includes a driver circuit. The driver circuit comprises a high-side switch that is activated in response to a positive driver input signal to provide a positive output signal at a driver output. The driver circuit also comprises a low-side switch that is activated in response to a negative driver input signal to provide a negative output signal at the driver output. The positive and negative driver input and output signals can be relative to respective cross-over magnitudes. The driver circuit further comprises at least one impedance-matching device configured to activate the low-side switch in response to a positive signal reflection at the driver output and to activate the high-side switch in response to a negative signal reflection at the driver output.
摘要翻译： 本发明的一个实施例包括驱动器电路。 驱动器电路包括响应于正驱动器输入信号而激活的高侧开关，以在驱动器输出端提供正输出信号。 驱动器电路还包括低侧开关，其响应于负驱动器输入信号被激活以在驱动器输出端提供负输出信号。 正负驱动器输入和输出信号可以相对于相应的交叉幅度。 驱动器电路还包括至少一个阻抗匹配装置，其被配置为响应于驱动器输出处的正信号反射而激活低侧开关，并且响应于驱动器输出处的负信号反射而激活高侧开关 。
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公开(公告)号：US20080239543A1
公开(公告)日：2008-10-02
申请号：US12016009
申请日：2008-01-17
IPC分类号： G11B20/22
CPC分类号： G11B5/02 , G11B20/10009 , G11B2005/0013 , G11B2220/2516
摘要： Methods and apparatus for generating a hard drive write signal are here in disclosed. A disclosed method comprises generating a hard drive write signal on an output of a switch based on an edge of the first control signal and reducing the hard drive write signal based on an edge of a second control signal via a second switch.
摘要翻译： 在此公开了用于产生硬盘驱动器写入信号的方法和装置。 所公开的方法包括：基于第一控制信号的边缘在开关的输出上产生硬盘驱动器写入信号，并且经由第二开关基于第二控制信号的边沿减少硬盘驱动器写入信号。
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公开(公告)号：US08040627B2
公开(公告)日：2011-10-18
申请号：US12016009
申请日：2008-01-17
CPC分类号： G11B5/02 , G11B20/10009 , G11B2005/0013 , G11B2220/2516
摘要： Methods and apparatus for generating a hard drive write signal are here in disclosed. A disclosed method comprises generating a hard drive write signal on an output of a switch based on an edge of the first control signal and reducing the hard drive write signal based on an edge of a second control signal via a second switch.
摘要翻译： 在此公开了用于产生硬盘驱动器写入信号的方法和装置。 所公开的方法包括：基于第一控制信号的边缘在开关的输出上产生硬盘驱动器写入信号，并且经由第二开关基于第二控制信号的边沿减少硬盘驱动器写入信号。
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