公开(公告)号：EP1187102A3

公开(公告)日：2005-12-28

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.

公开(公告)号：EP1720170B1

公开(公告)日：2008-11-26

申请号：EP06252214.9

申请日：2006-04-25

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

Inventor： Alini, Roberto ,  Rovati, Sergio Stefano ,  Vandenbossche, Eric ,  Paskins, Christopher

IPC: G11C17/16

CPC classification number: G11C17/16

公开(公告)号：EP1720170A1

公开(公告)日：2006-11-08

申请号：EP06252214.9

申请日：2006-04-25

Applicant: STMicroelectronics, Inc.

Inventor： Alini, Roberto ,  Rovati, Sergio Stefano ,  Vandenbossche, Eric ,  Paskins, Christopher

IPC: G11C17/16

CPC classification number: G11C17/16

Abstract: A one-time programmable circuit uses forced BJT h FE degradation to permanently store digital information as a logic zero or logic one state. The forced degradation is accomplished by applying a voltage or current to the BJT for a specific time to the reversed biased base-emitter junction, allowing a significant degradation of the junction without destroying it.

Abstract translation: 一次性可编程电路使用强制BJTħFE降解成数字信息永久地存储为逻辑零或逻辑一的状态。 强制降解是通过施加电压或电流到BJT为特定时间的反向偏置基极 - 发射极结，使结的显著降解而不破坏它来实现的。

公开(公告)号：EP1083550A3

公开(公告)日：2005-05-18

申请号：EP00307519.9

申请日：2000-08-31

Applicant: STMicroelectronics, Inc.

Inventor： Patti, Giuseppe ,  Alini, Roberto ,  Pakriswamy, Elango

IPC: G11B5/012 ,  G11B5/02

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

Abstract: A circuit (102,103) for controlling the write head (101) of a magnetic disk storage device includes a pull-up device (104) for selectively providing a current to the write head and a current sink circuit (106) selectively activated to draw current from the write head. A bootstrap circuit (108) is coupled to the current sink circuit. When reversing the direction of current flow through the write head from a first direction to the write head to a second direction from the write head terminal, the bootstrap circuit and the current sink circuit are activated to rapidly draw current from the write head. When the current in the write head nears and/or slightly surpasses the desired destination level, the bootstrap circuit is deactivated.

公开(公告)号：EP1003155A1

公开(公告)日：2000-05-24

申请号：EP99309211.3

申请日：1999-11-18

Applicant: STMicroelectronics, Inc.

Inventor： Patti, Giuseppe ,  Lee, Eugene C. ,  Alini, Roberto

IPC: G11B5/012 ,  G11B20/24 ,  G11B20/10

CPC classification number: G11B5/012 ,  G11B2005/0016

Abstract: To reduce thermal interference in the read signal of a disk drive, a variable or programmable resistance is used to change the transfer function of a filter (112) in the read channel of the disk drive to filter the read signal. The filter has a first cut-off frequency related to the programmed resistance during normal operation of the disk drive. When thermal interference is detected in the read signal, the resistance is programmed to another value resulting in the filter having a second cut-off frequency. The resistance element is variable or programmable to different values resulting in one of a multitude of cut-off frequencies for the filter.

Abstract translation: 为了减少在磁盘驱动器的读信号的热干扰，可变的或可编程的电阻被用来改变在盘驱动器的读通道的过滤器（112）的传递函数来过滤的读取信号。 该过滤器具有磁盘驱动器的正常手术期间相关的编程电阻的第一截止频率。 当在所读取的信号中检测到热干扰，电阻被编程为anotherValue导致过滤器具有第二截止频率。 电阻元件是可变的或可编程的，以在截止频率为所述过滤器的多个中的一个所得到的不同的值。

公开(公告)号：EP1587066A3

公开(公告)日：2005-11-02

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

Abstract: A write driver (510;1210) driving a write current (IL) through a head connected to the write head (570;1270) by an interconnect (560;1260). The write driver (510;1210) includes a circuit (514.556;1214,1256;1340) matching output resistance to the odd characteristic impedance of the interconnect (560;1260) and a voltage boosting circuit (512;1212). The voltage boosting circuit (512;1212) is connected between a supply voltage (VCC) and a voltage reference (VEE), and includes at least a current generator (440,1140), such as a MOS transistor, connected to the input node (422;1122) of a single capacitor (420;1120).

Abstract translation: 写入驱动器（510; 1210）通过互连（560; 1260）通过连接到写入头（570; 1270）的头来驱动写入电流（IL）。 写入驱动器（510; 1210）包括匹配互连（560; 1260）和升压电路（512; 1212）的奇特征阻抗的输出电阻的电路（514.556; 1214,1256; 1340）。 升压电路（512; 1212）连接在电源电压（VCC）和电压基准（VEE）之间，并且包括至少一个电流发生器（440,1140），例如MOS晶体管，连接到输入节点 （420; 1120）的电容器（422; 1122）。

公开(公告)号：EP1587066A2

公开(公告)日：2005-10-19

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

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

Abstract: A write driver (510;1210) driving a write current (IL) through a head connected to the write head (570;1270) by an interconnect (560;1260). The write driver (510;1210) includes a circuit (514.556;1214,1256;1340) matching output resistance to the odd characteristic impedance of the interconnect (560;1260) and a voltage boosting circuit (512;1212). The voltage boosting circuit (512;1212) is connected between a supply voltage (VCC) and a voltage reference (VEE), and includes at least a current generator (440,1140), such as a MOS transistor, connected to the input node (422;1122) of a single capacitor (420;1120).

Abstract translation: 通过驱动连接到写头的头的写入电流（IL）（570; 1270）; A写入驱动器（1210 510）通过向间连接（560; 1260）。 写入驱动器（510; 1210）包括电路（514556; 1214.1256; 1340）输出电阻匹配到互连的奇数特性阻抗（560; 1260）和一个升压电路（512; 1212）。 升压电路（512; 1212）被连接在电源电压（VCC）和参考电压（VEE）之间，并且至少包括一个电流发生器（440.1140）：如一个MOS晶体管，连接到所述输入节点 （422; 1122）的单个电容器的（420; 1120）。

公开(公告)号：EP1585130A2

公开(公告)日：2005-10-12

申请号：EP05251685.3

申请日：2005-03-18

Applicant: STMicroelectronics, Inc.

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

IPC: G11B20/10

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: 一种前置放大器，用于使用磁阻读取头校正磁盘驱动器中的热凹凸瞬变。 前置放大器具有接收来自读取头的信号的输入增益级和输出缓冲器，该输出缓冲器通过位于输入增益级和输出缓冲器之间的高通滤波器将读出器输出输出输出到读取通道，该读取通道被过滤掉热不平坦瞬变。 高通滤波器基于来自滤波器控制器的输入控制信号进行电压控制。 滤波器控制器使用用作峰值检测器的低通滤波器来检测高通滤波器的输入或输出电压中的峰值。 低通滤波器输出被应用于基于低通滤波器输出的绝对值的增加函数产生高通滤波器的控制信号的非线性函数发生器。

公开(公告)号：EP1083550A2

公开(公告)日：2001-03-14

申请号：EP00307519.9

申请日：2000-08-31

Applicant: STMicroelectronics, Inc.

Inventor： Patti, Giuseppe ,  Alini, Roberto ,  Pakriswamy, Elango

IPC: G11B5/012 ,  G11B5/02

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

Abstract: A circuit (102,103) for controlling the write head (101) of a magnetic disk storage device includes a pull-up device (104) for selectively providing a current to the write head and a current sink circuit (106) selectively activated to draw current from the write head. A bootstrap circuit (108) is coupled to the current sink circuit. When reversing the direction of current flow through the write head from a first direction to the write head to a second direction from the write head terminal, the bootstrap circuit and the current sink circuit are activated to rapidly draw current from the write head. When the current in the write head nears and/or slightly surpasses the desired destination level, the bootstrap circuit is deactivated.

Abstract translation: 一种用于控制磁盘存储装置的写入头（101）的电路（102,103）包括用于选择性地提供电流，以写头和一个电流吸收电路（106）的上拉设备（104）选择性地激活以汲取电流 从写头。 自举电路（108）被耦合到所述电流宿电路。 倒车时电流流过写入头从第一方向到写入头从写头端的第二方向的方向上，自举电路和所述电流宿电路被激活以快速绘制从写入头的电流。 当在写头的当前接近和/或略优于期望的目的地级，自举电路被停用。

公开(公告)号：EP1083549A2

公开(公告)日：2001-03-14

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.

Abstract translation: 用于控制磁盘存储装置的写入头（101）的电路包括耦合到写入头的终端（101a）的上拉装置（104），用于通过终端有选择地向写入头提供电流， 并联连接的第一（106）和第二（107）电流吸收电路，每个耦合到写入头终端并选择性地激活以从写入头抽取电流。 控制电路（130）分别启动上拉装置和第一和第二电流吸收电路以反转通过写入头的电流的方向。 当电流接近期望的电流电平时，第二电流吸收电路被去激活，并且上拉装置立即被激活一段预定的时间。 写头电流的电流过冲和欠冲最小。