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1.发明授权公开(公告)号：US10192578B1
公开(公告)日：2019-01-29
申请号：US16049331
申请日：2018-07-30
IPC分类号： G11B5/00 , G11B7/1263 , G11B5/09 , G11B20/18 , G11B5/012
摘要： A slider configured for heat-assisted magnetic recording includes a laser diode optically coupled to a waveguide of the slider. A power supply is coupled to the laser diode. A preamplifier is coupled to the power supply. The preamplifier is configured to monitor a forward voltage across the laser diode while operating the laser diode at a constant current during a write operation, detect a change in the forward voltage indicative of laser power instability, and generate a signal in response to detecting the forward voltage change.
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公开(公告)号：US09886970B1
公开(公告)日：2018-02-06
申请号：US15255090
申请日：2016-09-01
CPC分类号： G11B5/09 , G11B5/17 , G11B5/4853
摘要： In certain embodiments, an apparatus may comprise a first output driver connected to a first output via a first trace and a second output driver connected to a second output via a second trace. The first output driver may be configured to output a first drive signal to the first output to drive the first output and the first drive signal may cause first induced noise in the second trace. Further, the second output driver may be configured to output a second drive signal based on the first drive signal where the second drive signal may reduce the magnitude of the first induced noise at the second output.
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公开(公告)号：US09842618B1
公开(公告)日：2017-12-12
申请号：US15205224
申请日：2016-07-08
CPC分类号： G11B5/607 , G11B5/4853 , G11B5/6088 , G11B2005/0021
摘要： An apparatus includes a slider of a heat-assisted magnetic recording head. The slider comprises an air bearing surface, a substrate, and a plurality of electrical bond pads coupled to bias sources. A writer is positioned proximate the substrate. The writer comprises write coils coupled between first and second bond pads. At least one heater is coupled between the first and second bond pads. The at least one heater is disposed within the writer and is configured to thermally actuate the air bearing surface of the writer. A reader is disposed on the slider such that the writer is between the substrate and the reader. Write induced protrusion of the air bearing surface of the writer is moderated by stiffness of the substrate proximate the writer.
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公开(公告)号：US09672864B2
公开(公告)日：2017-06-06
申请号：US14879214
申请日：2015-10-09
发明人： Todd Michael Lammers , Kaizhong Gao
CPC分类号： G11B5/012 , G11B5/02 , G11B5/29 , G11B5/4886 , G11B5/746 , G11B20/10009 , G11B20/10018 , G11B20/10027 , G11B27/36 , G11B2005/0021 , G11B2220/20 , G11B2220/90
摘要： First and second signal patterns are used to write corresponding portions of first and second adjacent tracks to a magnetic storage medium. A characteristic of the first signal pattern is changed based on the second signal pattern, the changing of the characteristic reducing an adjacent track interference affecting the second track.
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公开(公告)号：US09355677B2
公开(公告)日：2016-05-31
申请号：US14168970
申请日：2014-01-30
CPC分类号： G11B20/10018 , G11B5/02
摘要： The implementations disclosed herein provide for a storage device including a preamplifier that dynamically adjusts at least one of a rise time and fall time of an analog write current pulse based on a length of a corresponding write transition and/or characteristics of a media location where the write transition is to be recorded.
摘要翻译： 本文公开的实现方案提供了一种存储设备，其包括前置放大器，其基于相应写入转变的长度和/或媒体位置的特性动态地调整模拟写入电流脉冲的上升时间和下降时间中的至少一个，其中 写入转换将被记录。
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公开(公告)号：US10199056B1
公开(公告)日：2019-02-05
申请号：US15871786
申请日：2018-01-15
发明人： Todd Michael Lammers , JianHua Xue , Javier I. Guzman , Andrew Thomas Jaeb , Bruce Douglas Buch
摘要： In certain embodiments, an apparatus may comprise a first output driver connected to a first output via a first trace and a second output driver connected to a second output via a second trace. The first output driver may be configured to output a first drive signal to the first output to drive the first output and the first drive signal may cause first induced noise in the second trace. Further, the second output driver may be configured to output a second drive signal based on the first drive signal where the second drive signal may reduce the magnitude of the first induced noise at the second output.
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公开(公告)号：US10056132B1
公开(公告)日：2018-08-21
申请号：US15045207
申请日：2016-02-16
IPC分类号： G06F5/16 , G11C11/4096 , G11C11/4076 , G11B5/02 , G06F5/06 , G06F13/42
CPC分类号： G06F13/4282 , G06F5/065 , G06F2205/067 , G11C7/16 , H03M1/0636 , H03M1/12 , H03M1/1265
摘要： Amplifiers, preamplifiers, and other circuits may have registers that are assigned to store data corresponding to certain functions. When the data stored in the registers are no longer needed, the registers may be assigned to store data corresponding to other functions, such as signal acquisition. The registers can be logically grouped into a virtual memory bank. The memory bank may store new data to a first register, and move data from the first register to a second register when new data arrives. In some embodiments, these registers and memory control circuit can be implemented within a preamplifier circuit.
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公开(公告)号：US09741386B1
公开(公告)日：2017-08-22
申请号：US15333761
申请日：2016-10-25
IPC分类号： G11B5/02 , G11B7/00 , G11B7/1263 , H01S5/042 , H01S5/0683 , G11B5/012 , G11B5/00
CPC分类号： G11B5/012 , G11B2005/0021 , H01S5/0427 , H01S5/0683
摘要： Before writing to a heat-assisted magnetic recording medium, a current of a laser is modulated about a default threshold current level. A modulation level of an optical power sensor is measured, the optical power sensor being coupled to detect optical output of the laser in response to the modulated current. A bias current for subsequent activation of the laser is adjusted based on the modulation level of the optical power sensor.
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公开(公告)号：US20150213813A1
公开(公告)日：2015-07-30
申请号：US14168970
申请日：2014-01-30
IPC分类号： G11B5/027
CPC分类号： G11B20/10018 , G11B5/02
摘要： The implementations disclosed herein provide for a storage device including a preamplifier that dynamically adjusts at least one of a rise time and fall time of an analog write current pulse based on a length of a corresponding write transition and/or characteristics of a media location where the write transition is to be recorded.
摘要翻译： 本文公开的实现方案提供了一种存储设备，其包括前置放大器，其基于相应写入转变的长度和/或媒体位置的特性动态地调整模拟写入电流脉冲的上升时间和下降时间中的至少一个，其中 写入转换将被记录。
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公开(公告)号：US20230005504A1
公开(公告)日：2023-01-05
申请号：US17856321
申请日：2022-07-01
摘要： Apparatus and method for transferring data in a data storage system, such as but not limited to a hard disc drive (HDD). An optical link is provided between an analog front end (AFE) of a data storage device controller circuit (SOC) and a preamplifier/driver circuit (preamp) mounted to a rotary actuator to transfer an analog domain signal. A selected component is extracted from the signal using a modulation element such as a micro-resonance ring (MRR) or a Mach-Zehnder Interferometer Modulation (MZM) device. The extracted component is forwarded to a processing circuit to facilitate a transfer of data between a local memory and a non-volatile memory (NVM). The optical link includes a flexible portion in a flex circuit affixed to the rotary actuator and which supports the preamp. Multiplexed read, write, and power control signals are concurrently transmitted via the optical link. The link can concurrently service multiple head-disc assemblies (HDAs).
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