公开(公告)号：US07023640B1

公开(公告)日：2006-04-04

申请号：US10856400

申请日：2004-05-27

申请人： Raffi Codilian ,  Lan V. Ngo ,  Norman D. Gardner

发明人： Raffi Codilian ,  Lan V. Ngo ,  Norman D. Gardner

IPC分类号： G11B19/04 ,  G11B21/02 ,  G11B19/02

CPC分类号： G11B19/04 ,  G11B5/5582 ,  G11B5/596

摘要： A disk drive comprising a first sensor mounted on a nominally stationary portion of the disk drive and adapted to detect acceleration disturbances of the disk drive. The disk drive further comprising: a dual-function subsystem having a first circuit adapted to provide a write-inhibit signal and a second circuit adapted to provide a feed-forward basis signal, the dual-function subsystem adapted to receive a first sensor signal from the first sensor and to provide (a) the write-inhibit signal based on the received first sensor signal and a first threshold value, and (b) the feed-forward basis signal based on the received first sensor signal.

摘要翻译： 一种磁盘驱动器，包括安装在磁盘驱动器的标称静止部分上并适于检测磁盘驱动器的加速度干扰的第一传感器。 所述磁盘驱动器还包括：双功能子系统，具有适于提供写禁止信号的第一电路和适于提供前馈基准信号的第二电路，所述双功能子系统适于从 并且基于所接收的第一传感器信号和第一阈值提供（a）禁止写入信号，以及（b）基于所接收的第一传感器信号的前馈基准信号。

公开(公告)号：US06900959B1

公开(公告)日：2005-05-31

申请号：US10405013

申请日：2003-03-31

申请人： Norman D. Gardner ,  Robert P. Ryan

发明人： Norman D. Gardner ,  Robert P. Ryan

IPC分类号： G11B5/54 ,  G11B5/55 ,  G11B5/596

CPC分类号： G11B5/5569 ,  G11B5/54 ,  G11B5/5534 ,  G11B5/5547

摘要： A disk drive is disclosed employing an offset-nulling amplifier for detecting a back EMF voltage of a voice coil motor (VCM) in a velocity mode servo control system. The offset-nulling amplifier comprises a differential amplifier, an input stage for swapping the polarity of the input voltage at a periodic interval, and an output stage comprising a single-ended amplifier having an input switched at the periodic interval between the positive and negative outputs of the differential amplifier.

摘要翻译： 公开了一种使用偏移零位放大器来检测速度模式伺服控制系统中的音圈电机（VCM）的反电动势电压的盘驱动器。 偏移零位放大器包括差分放大器，用于以周期性间隔交换输入电压的极性的输入级，以及包括具有在正和负输出之间的周期性间隔切换的输入的单端放大器的输出级 的差分放大器。

公开(公告)号：US08300348B1

公开(公告)日：2012-10-30

申请号：US12823359

申请日：2010-06-25

申请人： Yanning Liu ,  Norman D. Gardner

发明人： Yanning Liu ,  Norman D. Gardner

IPC分类号： G11B21/02 ,  G11B5/596

CPC分类号： G11B5/5552 ,  G11B5/5547

摘要： A disk drive is disclosed comprising a disk, an actuator arm, a head coupled to a distal end of the actuator arm, a voice coil motor (VCM) operable to actuate the head over the disk in coarse movements by rotating the actuator arm about a pivot, and a microactuator operable to actuate the head over the disk in fine movements. A disk boundary condition is detected by moving the actuator arm toward one of an outer diameter of the disk and an inner diameter of the disk, and monitoring an induced voltage generated by the microactuator. The disk boundary condition is detected when the induced voltage exceeds a threshold.

摘要翻译： 公开了一种磁盘驱动器，包括盘，致动器臂，联接到致动器臂的远端的头部，音圈电机（VCM），可操作以通过围绕一个 枢轴和可操作以微细运动在头盘上致动头部的微致动器。 通过将致动器臂朝向盘的外径和盘的内径之一移动并监视微致动器产生的感应电压来检测盘边界条件。 当感应电压超过阈值时检测盘边界条件。

公开(公告)号：US08498172B1

公开(公告)日：2013-07-30

申请号：US13190533

申请日：2011-07-26

申请人： Charles R. Patton, III ,  Norman D. Gardner

发明人： Charles R. Patton, III ,  Norman D. Gardner

IPC分类号： G11C5/14

CPC分类号： G11C5/143 ,  G11C29/021

摘要： A data storage device (DSD) is disclosed comprising a non-volatile memory (NVM), such as a disk or non-volatile semiconductor memory, and control circuitry for detecting a power failure condition. A frequency range of a supply voltage from a first frequency to a second frequency is extracted, wherein the first frequency is greater than ten hertz, the second frequency is higher than the first frequency, and the second frequency is less than one megahertz. The power failure condition is detected in response to the extracted frequency range of the supply voltage.

摘要翻译： 公开了一种包括诸如盘或非易失性半导体存储器的非易失性存储器（NVM）以及用于检测电源故障状况的控制电路的数据存储设备（DSD）。 提取从第一频率到第二频率的电源电压的频率范围，其中第一频率大于十赫兹，第二频率高于第一频率，第二频率小于1兆赫兹。 响应于提供的电源电压的频率范围来检测电源故障条件。

公开(公告)号：US08351174B1

公开(公告)日：2013-01-08

申请号：US12608918

申请日：2009-10-29

申请人： Norman D. Gardner ,  Mingying Gu

发明人： Norman D. Gardner ,  Mingying Gu

IPC分类号： H02H3/24

CPC分类号： H02H3/243

摘要： An apparatus and method for regulating an output voltage (VO) of a voltage regulator during a brown-out condition is described. The apparatus comprises the voltage regulator, a brown-out protection circuit, a switch, and a first capacitor. The voltage regulator charges the first capacitor to the regulated output voltage VO. The brown-out protection circuit is coupled to the voltage regulator and the switch. In operation, the brown-out protection circuit detects the occurrence of an undervoltage condition based on a first undervoltage detection signal received at an undervoltage detection input, the brown-out protection circuit disables the voltage regulator and closes the switch to discharge the first capacitor to below a predetermined voltage level.

摘要翻译： 描述了用于在欠压状态期间调节电压调节器的输出电压（VO）的装置和方法。 该装置包括电压调节器，欠压保护电路，开关和第一电容器。 电压调节器将第一个电容器充电到调节的输出电压VO。 欠压保护电路耦合到电压调节器和开关。 在运行中，欠压保护电路根据在欠压检测输入端接收到的第一欠电压检测信号，检测欠压状态的发生，欠压保护电路使电压调节器无效，闭合开关，将第一电容器放电至 低于预定电压电平。