公开(公告)号：EP1587066B1

公开(公告)日：2009-04-08

申请号：EP05008158.7

申请日：2005-04-14

Applicant: STMicroelectronics S.r.l. ,  STMicroelectronics, Inc.

Inventor： Venca, Alessandro ,  Alini, Roberto ,  Posat, Baris

IPC: G11B5/02 ,  G05F3/26

CPC classification number: G11B5/02 ,  G11B5/022 ,  G11B2005/0018 ,  H02M3/07

公开(公告)号：EP1310955A3

公开(公告)日：2007-02-21

申请号：EP02257758.9

申请日：2002-11-08

Applicant: STMicroelectronics, Inc.

Inventor： Venca, Alessandro ,  Posat, Baris ,  Ozanoglu, Kemal ,  Alini, Roberto

IPC: G11B19/02 ,  G11B5/012 ,  G11B5/02

CPC classification number: G11B5/022 ,  G11B5/012 ,  G11B5/02 ,  G11B5/09 ,  G11B2005/0013

Abstract: A circuit and method are disclosed for relatively rapidly causing the current flowing through a write head to transition between steady states without generating an appreciable amount of capacitively-coupled noise. Embodiments of the present invention generally provide drive voltage signals to the write head that have no common mode voltage levels during transitions between steady state current levels in the write head. In other words, the drive voltage signals applied to the write head are substantially entirely differential during write head current transitions. In an exemplary embodiment of the present invention, a driver circuit (100) includes switching circuitry (111,112,113,114,116,117,118,119) connected between the terminals (42A,42B) of the write head (42) and reference voltage supplies, such as positive and negative voltage supplies. The driver circuit further includes timing circuitry (125) that generates control signals for controlling the switching circuitry.

公开(公告)号：EP1585130A3

公开(公告)日：2005-12-14

申请号：EP05251685.3

申请日：2005-03-18

Applicant: STMicroelectronics, Inc.

Inventor： Ozanoglu, Kemal ,  Posat, Baris ,  Alini, Roberto

IPC: G11B20/22

CPC classification number: G11B20/10009 ,  G11B20/22 ,  G11B2005/0016

Abstract: A preamplifier for correcting for thermal asperity transients in disk drives using magneto resistive read heads. The preamplifier has an input gain stage receiving a signal from the read head and an output buffer outputting a reader output to a read channel that is filtered of thermal asperity transients by a high pass filter positioned between the input gain stage and the output buffer. The high pass filter is voltage controlled based on an input control signal from a filter controller. The filter controller uses a low pass filter functioning as a peak detector to detect peaks in either the input or output voltage of the high pass filter. The low pass filter output is applied to a non-linear function generator generating the control signal for the high pass filter based on an increasing function of the absolute value of the low pass filter output.

Abstract translation: 前置放大器，用于校正使用磁阻读取磁头的磁盘驱动器中的热突起瞬变。 前置放大器具有从读取头接收信号的输入增益级以及将读取器输出输出到读取通道的输出缓冲器，所述读取通道由位于输入增益级和输出缓冲器之间的高通滤波器对热异常瞬态进行滤波。 高通滤波器是基于来自滤波器控制器的输入控制信号进行电压控制的。 滤波器控制器使用低通滤波器作为峰值检测器来检测高通滤波器输入或输出电压中的峰值。 基于低通滤波器输出的绝对值的递增函数，将低通滤波器输出应用于产生用于高通滤波器的控制信号的非线性函数发生器。

公开(公告)号：EP1310955A2

公开(公告)日：2003-05-14

申请号：EP02257758.9

申请日：2002-11-08

Applicant: STMicroelectronics, Inc.

Inventor： Venca, Alessandro ,  Posat, Baris ,  Ozanoglu, Kemal ,  Alini, Roberto

IPC: G11B19/02 ,  G11B5/012 ,  G11B5/02

CPC classification number: G11B5/022 ,  G11B5/012 ,  G11B5/02 ,  G11B5/09 ,  G11B2005/0013

Abstract: A circuit and method are disclosed for relatively rapidly causing the current flowing through a write head to transition between steady states without generating an appreciable amount of capacitively-coupled noise. Embodiments of the present invention generally provide drive voltage signals to the write head that have no common mode voltage levels during transitions between steady state current levels in the write head. In other words, the drive voltage signals applied to the write head are substantially entirely differential during write head current transitions. In an exemplary embodiment of the present invention, a driver circuit (100) includes switching circuitry (111,112,113,114,116,117,118,119) connected between the terminals (42A,42B) of the write head (42) and reference voltage supplies, such as positive and negative voltage supplies. The driver circuit further includes timing circuitry (125) that generates control signals for controlling the switching circuitry.

Abstract translation: 公开了一种电路和方法，用于相对快速地使流过写入头的电流在稳定状态之间转变而不产生可观量的电容耦合噪声。 本发明的实施例通常在写入头中的稳态电流电平之间的转换期间向写入头提供不具有共模电压电平的驱动电压信号。 换句话说，施加到写入头的驱动电压信号在写入头电流转换期间基本上完全不同。 在本发明的示例性实施例中，驱动器电路（100）包括连接在写入头（42）的端子（42A，42B）之间的开关电路（111,112,113,114,116,117,118,119）和诸如正和负电压源的参考电压源。 驱动器电路还包括产生用于控制开关电路的控制信号的定时电路（125）。

公开(公告)号：EP1083549B1

公开(公告)日：2010-02-17

申请号：EP00307508.2

申请日：2000-08-31

Applicant: STMicroelectronics, Inc.

Inventor： Patti, Giuseppe ,  Alini, Roberto ,  DeNoyer, Gilles P.

IPC: G11B5/012 ,  G11B5/02 ,  G11B5/09

CPC classification number: G11B5/022 ,  G11B5/012 ,  G11B5/02 ,  G11B5/09

公开(公告)号：EP1603120A1

公开(公告)日：2005-12-07

申请号：EP05252821.3

申请日：2005-05-09

Applicant: STMicroelectronics, Inc.

Inventor： Venca, Alessandro ,  Alini, Roberto ,  Posat, Baris

IPC: G11B5/02 ,  G05F3/26

CPC classification number: G11B5/09 ,  G11B2005/0016 ,  H02M3/073

Abstract: A write driver driving a write current through a head connected to the write head by an interconnect. The write driver includes a circuit matching output resistance to the odd characteristic impedance of the interconnect and a voltage boosting circuit. The voltage boosting circuit in connected between a high voltage reference or supply voltage and a low voltage reference, and includes a current source, such as a MOS transistor, connected to the input node of a capacitor. During the overshoot duration, the current source operates at saturation to generate a pulsed current with an amplitude of half the load current. The circuit includes another transistor in series with the current generator between the capacitor and the driver output. A forward bias diode is connected between the capacitor output node and high voltage reference and enters reverse bias during overshoot duration swinging the driver output voltage above supply voltage.

Abstract translation: 写驱动器通过连接到写头的头驱动写入电流。 写驱动器包括匹配输出电阻到互连的奇特特性阻抗的电路和升压电路。 连接在高电压基准电源电压和低电压基准之间的升压电路，并且包括连接到电容器的输入节点的诸如MOS晶体管的电流源。 在过冲持续时间期间，电流源工作在饱和状态，以产生具有一半负载电流幅度的脉冲电流。 该电路包括与电容器和驱动器输出之间的电流发生器串联的另一个晶体管。 正向偏置二极管连接在电容器输出节点和高电压基准之间，并在驱动器输出电压高于电源电压的过冲持续时间内进入反向偏置。

公开(公告)号：EP1587067A3

公开(公告)日：2005-11-02

申请号：EP05252273.7

申请日：2005-04-12

Applicant: STMicroelectronics, Inc.

Inventor： Venca, Alessandro ,  Alini, Roberto ,  Posat, Baris

IPC: G11B5/02 ,  G05F3/26 ,  H04L25/02

CPC classification number: G11B5/02

Abstract: A write driver for driving a write current through a write head connected to the write head by an interconnect or flexible transmission line. The write driver includes a circuit matching an output impedance of the write driver to the odd characteristic impedance of the interconnect and includes a current source generating a current output to the write head. The write driver provides a current amplification effect as the output current is half the write current driven through the write coil. The impedance matching circuit includes an output resistor with a resistance equal to the odd characteristic impedance of the interconnect. The write driver includes a voltage source that operates to maintain a voltage drop of zero on the output resistor during the initial period of twice the transmission delay of the interconnect.

公开(公告)号：EP1587067A2

公开(公告)日：2005-10-19

申请号：EP05252273.7

申请日：2005-04-12

Applicant: STMicroelectronics, Inc.

Inventor： Venca, Alessandro ,  Alini, Roberto ,  Posat, Baris

IPC: G11B5/02

CPC classification number: G11B5/02

Abstract: A write driver for driving a write current through a write head connected to the write head by an interconnect or flexible transmission line. The write driver includes a circuit matching an output impedance of the write driver to the odd characteristic impedance of the interconnect and includes a current source generating a current output to the write head. The write driver provides a current amplification effect as the output current is half the write current driven through the write coil. The impedance matching circuit includes an output resistor with a resistance equal to the odd characteristic impedance of the interconnect. The write driver includes a voltage source that operates to maintain a voltage drop of zero on the output resistor during the initial period of twice the transmission delay of the interconnect.

Abstract translation: 用于驱动写入电流的写入驱动器通过由互连或柔性传输线连接到写入头的写入头。 写入驱动器包括将写入驱动器的输出阻抗匹配到互连的奇特性阻抗的电路，并且包括产生到写入头的电流输出的电流源。 写入驱动器提供电流放大效应，因为输出电流是通过写入线圈驱动的写入电流的一半。 阻抗匹配电路包括具有等于互连的奇特性阻抗的电阻的输出电阻器。 写入驱动器包括电压源，该电压源用于在互连的传输延迟的两倍的初始时段期间在输出电阻器上保持零电压降。

公开(公告)号：EP1083549A3

公开(公告)日：2005-05-18

申请号：EP00307508.2

申请日：2000-08-31

Applicant: STMicroelectronics, Inc.

Inventor： Patti, Giuseppe ,  Alini, Roberto ,  DeNoyer, Gilles P.

IPC: G11B5/012 ,  G11B5/02

CPC classification number: G11B5/022 ,  G11B5/012 ,  G11B5/02 ,  G11B5/09

Abstract: A circuit for controlling the write head (101) of a magnetic disk storage device includes a pull-up device (104) coupled to a terminal (101a) of the write head, for selectively providing a current to the write head through the terminal, parallel-connected first (106) and second (107) current sink circuits, each coupled to the write head terminal and selectively activated to draw current from the write head. A control circuit (130) individually activates the pull-up device and the first and second current sink circuits to reverse the direction of current flow through the write head. When the current nears the desired current level, the second current sink circuit is deactivated and the pull-up device is immediately activated for a predetermined period of time. Current overshoot and undershoot of the write head current is minimized.

公开(公告)号：EP1187102A2

公开(公告)日：2002-03-13

申请号：EP01307226.9

申请日：2001-08-24

Applicant: STMicroelectronics, Inc.

Inventor： Alini, Roberto ,  Lam, Quocdzung T. ,  Chew, Xiaokun Liu ,  MacCornack, Mark ,  Bezinque, David Joseph ,  Lee, Tehri ,  Le, Su Dang ,  de la Soujeole, Axel Alegre ,  Denoyer, Gilles

IPC: G11B5/012 ,  G11B5/09

CPC classification number: G11B5/022 ,  G11B5/012 ,  G11B5/02 ,  G11B5/09 ,  G11B5/40 ,  G11B2005/001 ,  G11B2005/0013

Abstract: A method is disclosed for controlling the write head of a magnetic disk storage device. The method includes sinking current from the first terminal (2A) of the write head (2) and sourcing current to the second terminal (2B) of the write head substantially simultaneously with sinking current from the first terminal so that a first steady state voltage level appears on the first terminal of the write head and a second steady state voltage level appears on the second terminal thereof that are approximately at a midpoint between a high reference voltage level and a low reference voltage level. The common mode voltage of the write head is substantially constant over time.

Abstract translation: 公开了一种用于控制磁盘存储装置的写入头的方法。 该方法包括从写入头（2）的第一端子（2A）吸收电流并且将源电流基本上与来自第一端子的吸收电流同时地馈送到写入头的第二端子（2B），使得第一稳态电压电平 出现在写入头的第一端子上，第二稳态电压电平出现在其第二端上，其大致在高参考电压电平和低参考电压电平之间的中点。 写头的共模电压随时间基本上是恒定的。