公开(公告)号：EP1441341A2

公开(公告)日：2004-07-28

申请号：EP04250285.6

申请日：2004-01-20

申请人： STMicroelectronics, Inc.

发明人： Posat, Baris ,  Ozanoglu, Kemal ,  Venca, Alessandro

IPC分类号： G11B20/00 ,  G11B5/00

CPC分类号： G11B20/10009 ,  G11B5/02 ,  G11B5/09 ,  G11B2005/0013 ,  G11B2005/0029 ,  H03F1/42 ,  H03F3/45278 ,  H03F2200/36 ,  H03F2200/432 ,  H03F2203/45318 ,  H03F2203/45544 ,  H03F2203/45594 ,  H03F2203/45648

摘要： An amplifying circuit and method are disclosed for amplifying electrical signals, such as electrical signals generated by the read head of a disk drive. The circuit includes a pair of cross-coupled differential amplifier circuits. Each differential amplifier circuit is asymmetric, including two input transistors of different transistor types. For instance, a first of the two input transistors of each differential amplifier circuit may be a bipolar transistor and a second of the two input transistors may be a field effect transistor. By utilizing asymmetric differential amplifier circuits, a relatively wider operating frequency range is obtained.

公开(公告)号：EP1441341A3

公开(公告)日：2008-11-05

申请号：EP04250285.6

申请日：2004-01-20

申请人： STMicroelectronics, Inc.

发明人： Posat, Baris ,  Ozanoglu, Kemal ,  Venca, Alessandro

IPC分类号： G11B20/10 ,  G11B5/012 ,  G11B5/09 ,  H03F3/45

CPC分类号： G11B20/10009 ,  G11B5/02 ,  G11B5/09 ,  G11B2005/0013 ,  G11B2005/0029 ,  H03F1/42 ,  H03F3/45278 ,  H03F2200/36 ,  H03F2200/432 ,  H03F2203/45318 ,  H03F2203/45544 ,  H03F2203/45594 ,  H03F2203/45648

摘要： An amplifying circuit and method are disclosed for amplifying electrical signals, such as electrical signals generated by the read head of a disk drive. The circuit includes a pair of cross-coupled differential amplifier circuits. Each differential amplifier circuit is asymmetric, including two input transistors of different transistor types. For instance, a first of the two input transistors of each differential amplifier circuit may be a bipolar transistor and a second of the two input transistors may be a field effect transistor. By utilizing asymmetric differential amplifier circuits, a relatively wider operating frequency range is obtained.

摘要翻译： 公开了一种放大电路和方法，用于放大诸如由磁盘驱动器的读取头产生的电信号的电信号。 该电路包括一对交叉耦合的差分放大器电路。 每个差分放大器电路是不对称的，包括不同晶体管类型的两个输入晶体管 例如，每个差分放大器电路的两个输入晶体管中的第一个可以是双极晶体管，并且两个输入晶体管中的第二个可以是场效应晶体管。 通过使用非对称差分放大器电路，获得相对较宽的工作频率范围。

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

申请人： STMicroelectronics, Inc.

发明人： Ozanoglu, Kemal ,  Posat, Baris ,  Alini, Roberto

IPC分类号： G11B20/10

CPC分类号： G11B20/10009 ,  G11B20/22 ,  G11B2005/0016

摘要： 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.

摘要翻译： 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：EP1310955A3

公开(公告)日：2007-02-21

申请号：EP02257758.9

申请日：2002-11-08

申请人： STMicroelectronics, Inc.

发明人： Venca, Alessandro ,  Posat, Baris ,  Ozanoglu, Kemal ,  Alini, Roberto

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

CPC分类号： G11B5/022 ,  G11B5/012 ,  G11B5/02 ,  G11B5/09 ,  G11B2005/0013

摘要： 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

申请人： STMicroelectronics, Inc.

发明人： Ozanoglu, Kemal ,  Posat, Baris ,  Alini, Roberto

IPC分类号： G11B20/22

CPC分类号： G11B20/10009 ,  G11B20/22 ,  G11B2005/0016

摘要： 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.

摘要翻译： 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

申请人： STMicroelectronics, Inc.

发明人： Venca, Alessandro ,  Posat, Baris ,  Ozanoglu, Kemal ,  Alini, Roberto

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

CPC分类号： G11B5/022 ,  G11B5/012 ,  G11B5/02 ,  G11B5/09 ,  G11B2005/0013

摘要： 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.

摘要翻译： 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）。