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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：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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3.发明授权公开(公告)号：US07259624B2
公开(公告)日：2007-08-21
申请号：US11069030
申请日：2005-02-28
IPC分类号： H03F3/45
CPC分类号： H03F3/45
摘要： A low noise AC coupled amplifier having transistors sharing bias currents, and having a low band-pass corner frequency and consuming low power. The amplifier may be used in a magneto-resistive (MR) preamplifier to amplify a response from a MR sensor. Bipolar and MOS transistors are used in the front end, utilizing the advantages of each transistor type to achieve low noise as well as low band-pass corner. The amplifier has a modified structure achieving lower power by using a PNP transistor instead of an NPN transistor.
摘要翻译： 一种低噪声AC耦合放大器，其具有共享偏置电流的晶体管，并具有低频带转角频率并消耗低功率。 放大器可用于磁阻（MR）前置放大器以放大来自MR传感器的响应。 双极和MOS晶体管用于前端，利用每种晶体管类型的优点来实现低噪声以及低通带角。 放大器具有通过使用PNP晶体管而不是NPN晶体管来实现更低功率的改进结构。
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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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公开(公告)号：US06946909B2
公开(公告)日：2005-09-20
申请号：US10670069
申请日：2003-09-24
CPC分类号： H03F1/08 , H03F1/26 , H03F3/45502 , H03F2200/372 , H03F2203/45702
摘要： The present invention discloses an impedance matched low noise amplifier circuit (10) comprising a serially coupled first resistor (R1) and first transistor (R0), a serially coupled second resistor (R2) and second transistor (R1), a resistive sensor (RMR) coupled to the first transistor (R0) and the second transistor (R1), wherein the first resistor (R1) and the second resistor (R2) are coupled, and a transconductance feedback block (GM) coupled to the resistive sensor (RMR) and to the serially coupled resistors (R1, R2) and transistors (R0, R1).
摘要翻译： 本发明公开了一种阻抗匹配低噪声放大器电路（10），包括串联耦合的第一电阻器（R 1）和第一晶体管（R 0），串联耦合的第二电阻器（R 2）和第二晶体管（R 1） 耦合到第一晶体管（R 0）和第二晶体管（R 1）的电阻传感器（RMR），其中第一电阻器（R 1）和第二电阻器（R 2）被耦合，并且跨导反馈块（GM） 耦合到电阻传感器（RMR）和串联耦合电阻器（R 1，R 2）和晶体管（R 0，R 1）。
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6.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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7.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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8.发明授权Write driver with continuous impedance match and improved common mode symmetry 有权写持续阻抗匹配的驱动器和改进的共模对称性公开(公告)号：US07292074B2
公开(公告)日：2007-11-06
申请号：US10753691
申请日：2004-01-08
IPC分类号： G11B5/02
CPC分类号： G11B5/02 , G11B5/012 , G11B5/40 , G11B2005/0016
摘要： The present invention describes a voltage-mode boosting write driver circuit (160), comprising a plurality of inputs (WDP, WDN), a plurality of outputs (HWX, HWY), a transducer (L2), a flex interconnection (T1) coupled to the outputs (HWX, HWY) and to the transducer (L2), a first resistor (R15) and a second resistor (R43) coupled to the outputs (HWX, HWY) and to the transducer (L2), an H-switch (Q15, Q60, Q11, Q22) coupled to the resistors (R15, R43), and a plurality of top boosting circuits (Q42, Q47, R36, and Q43, Q48, R37) coupled to the outputs (HWX, HWY).
摘要翻译： 本发明描述了包括多个输入（WDP，WDN），多个输出（HWX，HWY），换能器（L 2），柔性互连（T 1）的电压模式升压写入驱动器电路 ）连接到所述输出（HWX，HWY）和所述换能器（L 2），耦合到所述输出端（HWX，HWY）和所述换能器（L 2）的第一电阻器（R 15）和第二电阻器 ），耦合到电阻器（R 15，R 43）的H开关（Q 15，Q 60，Q 11，Q 22）和多个顶部升压电路（Q42，Q47，R36和Q 43，Q 48，R 37）耦合到输出端（HWX，HWY）。
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公开(公告)号：US07190214B2
公开(公告)日：2007-03-13
申请号：US10765599
申请日：2004-01-27
IPC分类号： G06G7/12
CPC分类号： H03F3/45085 , H03F1/26 , H03F3/45632 , H03F3/45654 , H03F3/45748 , H03F2203/45362
摘要： An apparatus for use with a sensor includes first and second signal treating circuit segments coupled with the sensor for presenting a substantially balanced differential signaling representation of output signals from the sensor. Each respective signal treating circuit segment comprises a plurality of circuit elements having different electrical symmetries coupled in parallel and establishing a plurality of parallel signal paths having asymmetric signal handling characteristics. A feedback circuit is coupled with the first and second signal treating circuit segments and provides feedback signals to selected circuit elements in each of the first and second signal treating circuit segments. The feedback signals effect substantially balanced signal handling among the selected circuit elements having similar electrical symmetries.
摘要翻译： 与传感器一起使用的装置包括与传感器耦合的第一和第二信号处理电路段，用于呈现来自传感器的输出信号的基本平衡的差分信号表示。 每个相应的信号处理电路段包括具有并联耦合的不同电对称性的多个电路元件，并建立具有不对称信号处理特性的多个并行信号路径。 反馈电路与第一和第二信号处理电路段耦合，并向第一和第二信号处理电路段中的每一个中的选定电路元件提供反馈信号。 反馈信号在具有相似电对称性的所选择的电路元件中实现基本平衡的信号处理。
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10.发明授权High speed pre-driver with voltage reference for thin film head write driver 有权高速预驱动器，具有薄膜头写入驱动器的参考电压公开(公告)号：US07068450B2
公开(公告)日：2006-06-27
申请号：US10786967
申请日：2004-02-25
摘要： A preamplifier device (26) for a thin film transducer disk drive system having operation speeds up to and greater than 2 Gb/s. The device (26) includes a low power/high speed driver (203) having a cascaded Class AB buffer. In at least one embodiment the device (26) includes separated drive devices in the driver (203) and H-bridge circuit (205) realized in multiple smaller devices biased separately to reduce transistor self-heating effects and a further embodiment includes a reference (201) having a base cancellation scheme and a Class AB current source for improving accuracy and stability is such high speed devices.
摘要翻译： 一种用于薄膜换能器盘驱动系统的前置放大器装置（26），其具有高达和大于2Gb / s的操作速度。 装置（26）包括具有级联AB类缓冲器的低功率/高速驱动器（203）。 在至少一个实施例中，装置（26）包括在驱动器（203）中的分离的驱动装置和在多个较小的装置中实现的H桥电路（205），其分别偏置以减小晶体管自发热效应，另外的实施例包括参考 201）具有基本取消方案和用于提高精度和稳定性的AB类电流源是这样的高速装置。
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