公开(公告)号：US07675706B2

公开(公告)日：2010-03-09

申请号：US12039300

申请日：2008-02-28

Applicant: Rajkumar Jayaraman ,  Taras Dudar ,  Seungwoo Jung ,  Ashish Manjrekar

Inventor： Rajkumar Jayaraman ,  Taras Dudar ,  Seungwoo Jung ,  Ashish Manjrekar

IPC: G11B21/02 ,  G11B27/36

CPC classification number: G11B5/6005 ,  G11B5/582

Abstract: Methods and apparatus for proximity detection of hard disk drive read heads are disclosed. A disclosed method comprises forming a first signal having a frequency, a first amplitude, and a first offset voltage, forming a second offset voltage substantially equal to the first offset voltage from the first signal, amplifying the amplitude of the first signal to cause the resonant signal to have a second amplitude greater than the first, and forming a second signal having a frequency indicative of the location of a read head relative to a platter of a hard disk drive.

Abstract translation: 公开了用于硬盘驱动器读取头的接近检测的方法和装置。 所公开的方法包括形成具有频率，第一幅度和第一偏移电压的第一信号，从第一信号形成基本上等于第一偏移电压的第二偏移电压，放大第一信号的振幅以引起谐振 信号具有大于第一幅度的第二幅度，以及形成具有指示读取头相对于硬盘驱动器的盘的位置的频率的第二信号。

公开(公告)号：US08850252B2

公开(公告)日：2014-09-30

申请号：US13288355

申请日：2011-11-03

Applicant: Hemalkumar Chandrkant Doshi ,  Rajkumar Jayaraman ,  Seshendra Gadagottu ,  Narendra Damahe

Inventor： Hemalkumar Chandrkant Doshi ,  Rajkumar Jayaraman ,  Seshendra Gadagottu ,  Narendra Damahe

IPC: G06F1/32 ,  G06F1/00 ,  G06F3/00 ,  G06F13/20

CPC classification number: G06F13/20 ,  G06F13/385 ,  Y02D10/14 ,  Y02D10/151

Abstract: A USB host for wakeup from a sleep state includes a hold memory, a USB host controller, and a USB driver. When going to sleep, the USB driver sends a suspend command to the USB host controller in response to receiving a sleep command. The USB driver also reads a controller context from the USB host controller and saves the controller context in the hold memory. Thereafter, the USB driver turns off one or more supply potentials and one or more clocks in the host controller, and returns a sleep acknowledgement. While in sleep, the interface pins are placed in a hold state and notification to the operating system are disabled.

Abstract translation: 用于从休眠状态唤醒的USB主机包括保持存储器，USB主机控制器和USB驱动器。 当休眠时，USB驱动程序响应于接收到睡眠命令，向USB主机控制器发送挂起命令。 USB驱动程序还从USB主机控制器读取控制器上下文，并将控制器上下文保存在保持存储器中。 此后，USB驱动器关闭主机控制器中的一个或多个电源电压和一个或多个时钟，并返回睡眠确认。 在睡眠状态下，接口引脚处于保持状态，通知操作系统被禁用。

公开(公告)号：US20080204133A1

公开(公告)日：2008-08-28

申请号：US11712050

申请日：2007-02-28

Applicant: Paul A. Fontaine ,  Sachin Ranganathan ,  Rajkumar Jayaraman

Inventor： Paul A. Fontaine ,  Sachin Ranganathan ,  Rajkumar Jayaraman

IPC: H03F3/45

CPC classification number: H03F1/305

Abstract: Circuits and apparatus to reduce transient output noise in an audio amplifier are disclosed. A disclosed example apparatus comprises an amplifier, and an amplifier controller to digitally change a common-mode voltage of the amplifier to reduce an output noise of the amplifier.

Abstract translation: 公开了用于减少音频放大器中的瞬态输出噪声的电路和装置。 公开的示例性装置包括放大器和用于数字地改变放大器的共模电压以减小放大器的输出噪声的放大器控制器。

公开(公告)号：US20130117489A1

公开(公告)日：2013-05-09

申请号：US13288355

申请日：2011-11-03

Applicant: Hemalkumar Chandrkant Doshi ,  Rajkumar Jayaraman ,  Seshendra Gadagottu ,  Narendra Damahe

Inventor： Hemalkumar Chandrkant Doshi ,  Rajkumar Jayaraman ,  Seshendra Gadagottu ,  Narendra Damahe

IPC: G06F13/20

CPC classification number: G06F13/20 ,  G06F13/385 ,  Y02D10/14 ,  Y02D10/151

Abstract: A USB host for wakeup from a sleep state includes a hold memory, a USB host controller, and a USB driver. When going to sleep, the USB driver sends a suspend command to the USB host controller in response to receiving a sleep command. The USB driver also reads a controller context from the USB host controller and saves the controller context in the hold memory. Thereafter, the USB driver turns off one or more supply potentials and one or more clocks in the host controller, and returns a sleep acknowledgement. While in sleep, the interface pins are placed in a hold state and notification to the operating system are disabled.

Abstract translation: 用于从休眠状态唤醒的USB主机包括保持存储器，USB主机控制器和USB驱动器。 当休眠时，USB驱动程序响应于接收到睡眠命令，向USB主机控制器发送挂起命令。 USB驱动程序还从USB主机控制器读取控制器上下文，并将控制器上下文保存在保持存储器中。 此后，USB驱动器关闭主机控制器中的一个或多个电源电压和一个或多个时钟，并返回睡眠确认。 在睡眠状态下，接口引脚处于保持状态，通知操作系统被禁用。

公开(公告)号：US20090219650A1

公开(公告)日：2009-09-03

申请号：US12039300

申请日：2008-02-28

Applicant: Rajkumar Jayaraman ,  Taras Dudar ,  Seungwoo Jung ,  Ashish Manjrekar

Inventor： Rajkumar Jayaraman ,  Taras Dudar ,  Seungwoo Jung ,  Ashish Manjrekar

IPC: G11B15/60

CPC classification number: G11B5/6005 ,  G11B5/582

Abstract: Methods and apparatus for proximity detection of hard disk drive read heads are disclosed. A disclosed method comprises forming a first signal having a frequency, a first amplitude, and a first offset voltage, forming a second offset voltage substantially equal to the first offset voltage from the first signal, amplifying the amplitude of the first signal to cause the resonant signal to have a second amplitude greater than the first, and forming a second signal having a frequency indicative of the location of a read head relative to a platter of a hard disk drive.

Abstract translation: 公开了用于硬盘驱动器读取头的接近检测的方法和装置。 所公开的方法包括形成具有频率，第一幅度和第一偏移电压的第一信号，从第一信号形成基本上等于第一偏移电压的第二偏移电压，放大第一信号的振幅以引起谐振 信号具有大于第一幅度的第二幅度，以及形成具有指示读取头相对于硬盘驱动器的盘的位置的频率的第二信号。

公开(公告)号：US20090097178A1

公开(公告)日：2009-04-16

申请号：US11871691

申请日：2007-10-12

Applicant: Jagadeesh Krishnan ,  Angelo W. Pereira ,  Rajkumar Jayaraman ,  Paul H. Fontaine

Inventor： Jagadeesh Krishnan ,  Angelo W. Pereira ,  Rajkumar Jayaraman ,  Paul H. Fontaine

IPC: H02H3/08

CPC classification number: H03F3/2173 ,  H03F1/523 ,  H03F3/2171

Abstract: Methods and apparatus to detect an over-current in switching circuits are described. An example method to detect an over-current in a switching circuit includes randomly selecting a sensor from a plurality of sensors operatively coupled to an output stage of the switching circuit; detecting a first voltage via the randomly selected sensor; and comparing the first voltage to a reference voltage to generate a signal, wherein the signal indicates a status of the output stage of the switching circuit.

Abstract translation: 描述了检测开关电路中的过电流的方法和装置。 检测开关电路中的过电流的示例性方法包括从可操作地耦合到开关电路的输出级的多个传感器中随机选择传感器; 经由随机选择的传感器检测第一电压; 以及将所述第一电压与参考电压进行比较以产生信号，其中所述信号指示所述开关电路的输出级的状态。