公开(公告)号：US09165596B1

公开(公告)日：2015-10-20

申请号：US14656898

申请日：2015-03-13

Applicant: HGST Netherlands B.V.

Inventor： John Contreras ,  Nobumasa Nishiyama ,  Joey Martin Poss ,  Tuyen Van Trinh ,  Craig K. Yanagisawa ,  Yasunori Kubo

IPC: G11B5/09 ,  G11B5/02 ,  G11B20/10

CPC classification number: G11B20/10009 ,  G11B5/012 ,  G11B5/09

Abstract: A disk drive has multiple preamplifiers (preamps) connected to the system-on-a-chip (SOC) by a common transmission line with resistors between the preamps and the SOC. Each preamp includes a read resistor at the output of each read amplifier, and a write resistor at the input of each write driver. The resistors may be programmable resistors located in the preamps. The read resistors are at the source of the signal to the transmission line and the write resistors are at the termination of the signal from the transmission line. The read and write resistors provide impendence matching with the transmission line and the SOC when one of the preamps is selected as active, which enables the SOC to operate seamlessly with a common transmission line connected to all preamps.

Abstract translation: 磁盘驱动器具有通过具有前置放大器和SOC之间的电阻的公共传输线连接到片上系统（SOC）的多个前置放大器（前置放大器）。 每个前置放大器在每个读取放大器的输出端都有一个读取电阻，在每个写入驱动器的输入端都有一个写入电阻。 电阻器可以是位于前置放大器中的可编程电阻器。 读电阻位于传输线信号的源头​​，写电阻处于来自传输线的信号的终端。 读取和写入电阻器在前置放大器中的一个被选择为有效时，提供与传输线和SOC匹配的阻抗，这使得SOC能够与连接到所有前置放大器的公共传输线无缝地操作。

公开(公告)号：US08891189B1

公开(公告)日：2014-11-18

申请号：US14218591

申请日：2014-03-18

Applicant: HGST Netherlands B.V.

Inventor： John Contreras ,  Samir Y. Garzon ,  Bruce Alvin Gurney ,  David John Seagle

IPC: G11B5/09

CPC classification number: G11B5/02 ,  G11B2005/0013

Abstract: Disk drives with sliders including with an impedance compensation network in the signal path for the read sensor are described. The read signal bandwidth at the preamplifier is improved by the impedance compensation network to allow signals in the multi-GHz range from spin torque oscillators as well as tunnel magnetoresistance (TMR) sensors to be used. An embodiment of the invention achieves a signal layout balance by constructing two inductor-capacitor pair structures on the trailing edge of the slider that are integrated into the differential read signal traces. The differential balanced structure helps to suppress external signal interference pick-up from transferring from common-mode pick-up to differential mode.

Abstract translation: 描述了具有用于读取传感器的信号路径中的具有阻抗补偿网络的滑块的磁盘驱动器。 通过阻抗补偿网络改善了前置放大器处的读信号带宽，以允许使用自旋扭矩振荡器的多GHz范围内的信号以及隧道磁阻（TMR）传感器。 本发明的实施例通过在滑块的后沿上构建两个电感器 - 电容器对结构来实现信号布局平衡，该结构被集成到差分读信号迹线中。 差分平衡结构有助于抑制外部信号干扰接收从共模接收传输到差分模式。

公开(公告)号：US08804263B1

公开(公告)日：2014-08-12

申请号：US14015716

申请日：2013-08-30

Applicant: HGST Netherlands B.V.

Inventor： John Contreras ,  Samir Y. Garzon ,  Rehan Ahmed Zakai

IPC: G11B5/09

CPC classification number: G11B5/6076 ,  G11B5/607

Abstract: Embedded contact sensor controls for use in arm electronics (AE) in a disk drive are described that provide for removing undesirable offsets between the measured voltage across the ECS resistor in the slider and the balance resistor in ECS amplifier in the arm electronics (AE), which allows increased amplification of the resulting adjusted signal without saturation. Embodiments include a Zero-Offset Circuit, which can be activated periodically or on demand to sample and hold the present DC offset voltage in the ECS amplifier signal and subtract the DC offset voltage from ECS amplifier signal. The adjusted signal can then be further amplified without saturation.

Abstract translation: 描述了用于磁盘驱动器中的臂电子设备（AE）中的嵌入式接触传感器控制器，用于消除滑块中ECS电阻器两端的测量电压与臂电子设备（AE）中的ECS放大器中的平衡电阻之间的不期望的偏移， 这允许在没有饱和的情况下增加所得调节信号的放大。 实施例包括零偏移电路，其可以周期性地或根据需要激活以对ECS放大器信号中的当前DC偏移电压进行采样和保持，并从ECS放大器信号中减去DC偏移电压。 然后可以在没有饱和的情况下进一步放大经调整的信号。

公开(公告)号：US09564163B2

公开(公告)日：2017-02-07

申请号：US14678906

申请日：2015-04-03

Applicant: HGST Netherlands B.V.

Inventor： John Contreras ,  Ian Robson McFadyen ,  Erhard Schreck

IPC: G11B5/60

CPC classification number: G11B5/607

Abstract: A method, apparatus, and system are provided for implementing dual partially independent flyheight control (TFC) for hard disk drives (HDDs). A dual thermal flyheight control (TFC) includes a series connected first heater resistor and a second heater resistor connected between a pair of wires. A capacitor is connected in parallel with the first heater resistor providing a frequency dependent shunt to the parallel connected first heater resistor. TFC electrical bias signals are applied to the first heater resistor and second heater resistor carried by the pair of wires. For example, the TFC electrical bias signals include high frequency electrical signals including a frequency range between 1 MHz and 100 MHz having a set amplitude in a voltage range between 0 and 7 Volts, and/or DC current signal.

Abstract translation: 提供了一种用于实现用于硬盘驱动器（HDD）的双重部分独立的飞行高度控制（TFC）的方法，装置和系统。 双重热电高度控制（TFC）包括连接在一对电线之间的串联的第一加热电阻器和第二加热电阻器。 电容器与第一加热电阻并联连接，为并联的第一加热电阻提供频率相关的分流。 TFC电偏置信号被施加到由一对导线承载的第一加热电阻器和第二加热电阻器。 例如，TFC电偏置信号包括高频电信号，包括在1MHz和100MHz之间的频率范围，在0和7V之间的电压范围内具有设定的幅度和/或DC电流信号。

公开(公告)号：US20160293194A1

公开(公告)日：2016-10-06

申请号：US14678906

申请日：2015-04-03

Applicant: HGST Netherlands B.V.

Inventor： John Contreras ,  Ian Robson McFadyen ,  Erhard Schreck

IPC: G11B5/60

CPC classification number: G11B5/607

Abstract: A method, apparatus, and system are provided for implementing dual partially independent flyheight control (TFC) for hard disk drives (HDDs). A dual thermal flyheight control (TFC) includes a series connected first heater resistor and a second heater resistor connected between a pair of wires. A capacitor is connected in parallel with the first heater resistor providing a frequency dependent shunt to the parallel connected first heater resistor. TFC electrical bias signals are applied to the first heater resistor and second heater resistor carried by the pair of wires. For example, the TFC electrical bias signals include high frequency electrical signals including a frequency range between 1 MHz and 100 MHz having a set amplitude in a voltage range between 0 and 7 Volts, and/or DC current signal.

Abstract translation: 提供了一种用于实现用于硬盘驱动器（HDD）的双重部分独立的飞行高度控制（TFC）的方法，装置和系统。 双重热电高度控制（TFC）包括连接在一对电线之间的串联的第一加热电阻器和第二加热电阻器。 电容器与第一加热电阻并联连接，为并联的第一加热电阻提供频率相关的分流。 TFC电偏置信号被施加到由一对导线承载的第一加热电阻器和第二加热电阻器。 例如，TFC电偏置信号包括高频电信号，包括在1MHz和100MHz之间的频率范围，在0和7V之间的电压范围内具有设定的幅度和/或DC电流信号。

公开(公告)号：US09275656B1

公开(公告)日：2016-03-01

申请号：US14804063

申请日：2015-07-20

Applicant: HGST Netherlands B.V.

Inventor： John Contreras ,  Samir Y. Garzon ,  Weldon Mark Hanson ,  Alexander Taratorin

IPC: G11B5/09 ,  G11B20/10

CPC classification number: G11B5/09 ,  G11B5/02 ,  G11B20/10009 ,  G11B20/10018

Abstract: Disk drives with a Channel System and Write Driver Preamp architecture that dynamically adjusts the write driver's signal wave-shape depending on the write data signal pattern are described. The wave-shape control signal is generated in the Channel and transmitted to the Write Driver Preamp. Embodiments of the invention provide discrete n-level overshoot amplitude control using amplitude-level modulated (AML) signal. One embodiment implements a look-ahead strategy overshoot amplitude control where the overshoot amplitude for each transition depends only on the subsequent (following) bits in the data stream and not on any previously recorded data.

Abstract translation: 描述了具有通道系统和写入驱动器的磁盘驱动器根据写入数据信号模式动态地调整写入驱动器的信号波形的前置放大器架构。 波形控制信号在通道中产生并发送到写驱动器前置放大器。 本发明的实施例提供使用幅度电平调制（AML）信号的离散n级过冲幅度控制。 一个实施例实现了先行策略超调幅度控制，其中每个转换的过冲幅度仅取决于数据流中的后续（后续）位，而不依赖于任何先前记录的数据。

公开(公告)号：US09196266B1

公开(公告)日：2015-11-24

申请号：US14340690

申请日：2014-07-25

Applicant: HGST Netherlands B.V.

Inventor： John Contreras ,  Albert John Wallash ,  Rehan Ahmed Zakai

IPC: G11B5/48 ,  G11B5/09

CPC classification number: G11B5/484 ,  G11B5/09 ,  G11B5/4846 ,  G11B5/4853 ,  G11B5/486

Abstract: An interconnect between the read/write circuitry and the read/write head in a magnetic recording hard disk drive (HDD) for two-dimensional magnetic recording (TDMR) has the read sensor signal lines located on a lower level of a bi-level structure of conductive lines. Common return lines are located on an upper level above the signal lines and on the lower level between the signal lines. All of the return lines on the upper level are connected to one another by cross-connect lines, and vias are located along the interconnect and connect the upper return lines with the lower return lines and with the ground plane of the interconnect's electrically conductive substrate. The interconnect is a coaxial-like interconnect because the return lines are located around each signal line and thus shield each signal line from the other signal lines, much like the outer conductive shield of a coaxial cable.

Abstract translation: 用于二维磁记录（TDMR）的磁记录硬盘驱动器（HDD）中的读/写电路和读/写磁头之间的互连具有位于双电平结构的较低电平上的读传感器信号线 的导线。 公共返回线位于信号线上方的上层和信号线之间的较低电平上。 上层的所有返回线通过交叉连接线彼此连接，并且通孔沿着互连件定位，并且将上返回线与下返回线和互连导电基板的接地平面连接。 互连是同轴的互连，因为返回线位于每个信号线周围，并且因此屏蔽每条信号线与其它信号线，非常类似于同轴电缆的外部导电屏蔽。

公开(公告)号：US08988829B1

公开(公告)日：2015-03-24

申请号：US14489477

申请日：2014-09-18

Applicant: HGST Netherlands B.V.

Inventor： John Contreras ,  Joey Martin Poss ,  Rehan Ahmed Zakai

IPC: G11B21/20 ,  G11B20/10 ,  G11B5/48

CPC classification number: G11B5/486 ,  G11B5/484

Abstract: Disk drive embodiments with common lead connections in the slider, suspension, and preamplifier are described. The arm electronics IC includes a preamplifier with single-ended input from the set of signal traces that include a common signal return lead for the plurality of read transducers (readers) in the slider. Two embodiments of the preamps are described that include a single-ended design and a pseudo-single-ended design. Each embodiment supplies the required bias to each read transducer using an operational transconductance amplifier (OTA) that drives a variable current source connected to the transducer. The positive input to the OTA is a DC voltage with the AC signal from the transducer imposed on it. The negative input is a DC reference voltage. Various embodiments of the signal trace configuration on the suspension are described including a single and double layer embodiments.

Abstract translation: 描述了在滑块，悬架和前置放大器中具有公共引线连接的磁盘驱动器实施例。 臂电子IC包括具有来自该组信号迹线的单端输入的前置放大器，其包括用于滑块中的多个读换能器（读取器）的公共信号返回引线。 描述前置放大器的两个实施例，其包括单端设计和伪单端设计。 每个实施例使用驱动连接到换能器的可变电流源的运算跨导放大器（OTA）向每个读取换能器提供所需的偏置。 OTA的正输入是直流电压，其上施加有传感器的交流信号。 负输入为直流参考电压。 描述悬架上的信号迹线配置的各种实施例，其包括单层和双层实施例。

公开(公告)号：US09280993B2

公开(公告)日：2016-03-08

申请号：US14104143

申请日：2013-12-12

Applicant: HGST Netherlands B.V.

Inventor： John Contreras ,  Zhen Jin ,  Yuanpeng Li ,  Xiaoyu Sui

IPC: G11B5/465

CPC classification number: G11B5/465

Abstract: A method, apparatus, and system for implementing enhanced asymmetric degauss control for a write head for hard disk drives. A degauss period is provided at the end of a write. The write head is driven asymmetrically with respect to the positive and negative driving currents during the degauss period. The average value of the write current during the degauss period is non-zero.

Abstract translation: 一种用于为硬盘驱动器的写头实现增强的不对称消磁控制的方法，装置和系统。 在写入结束时提供消磁周期。 写磁头相对于消磁期间的正和负驱动电流是非对称驱动的。 消磁期间写入电流的平均值为非零。

公开(公告)号：US09275664B2

公开(公告)日：2016-03-01

申请号：US14106308

申请日：2013-12-13

Applicant: HGST Netherlands B.V.

Inventor： John Contreras ,  Nobumasa Nishiyama ,  Albert Wallash

IPC: G11B5/48

CPC classification number: G11B5/4846 ,  G11B5/486

Abstract: A flex cable with a shielding layer for use in a disk drive is described. The flex cable connects the actuator to the system electronics. The flex cable has a shielding layer that provides RF shielding for the embedded signal traces. In embodiments the shielding layer is connected to the baseplate or device enclosure ground at one or more selected points on the bracket end of the flex cable that are separated from the signal paths. Embodiments of the shielding layer include rows of apertures or windows that are aligned with selected signal traces such as the read and write signal traces and serve to maintain the desired impedance in the read and write signal traces. In one embodiment the shielding layer extends over a selected portion of the flex cable that includes the bracket end and the area under the first stiffener.

Abstract translation: 描述了具有用于磁盘驱动器的屏蔽层的柔性电缆。 柔性电缆将执行器连接到系统电子设备。 柔性电缆具有为嵌入式信号迹线提供RF屏蔽的屏蔽层。 在实施例中，屏蔽层在与信号路径分离的柔性电缆的支架端上的一个或多个选择点处连接到基板或设备外壳接地。 屏蔽层的实施例包括与所选择的信号迹线对准的孔或窗口排，例如读取和写入信号迹线，并且用于在读取和写入信号迹线中保持期望的阻抗。 在一个实施例中，屏蔽层在柔性电缆的选定部分上延伸，包括支架端和第一加强件下方的区域。