公开(公告)号：US07564638B2

公开(公告)日：2009-07-21

申请号：US11438850

申请日：2006-05-23

申请人： Baris Posat ,  Kemal Ozanoglu ,  Alessandro Venca

发明人： Baris Posat ,  Kemal Ozanoglu ,  Alessandro Venca

IPC分类号： G11B5/02

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。 通过利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：US06944834B2

公开(公告)日：2005-09-13

申请号：US10349540

申请日：2003-01-22

申请人： Baris Posat ,  Kemal Ozanoglu ,  Alessandro Venca

发明人： Baris Posat ,  Kemal Ozanoglu ,  Alessandro Venca

IPC分类号： G06F7/60 ,  G06F17/10 ,  G06F17/50

CPC分类号： G06F17/5036

摘要： A method and system are disclosed for generating descriptions of circuits representative of the behavior of dynamic systems. A state space model representing a dynamic system may be used to generate an electronic circuit equivalent having operating characteristics equivalent to the operating characteristics of the dynamic system. The electronic circuit equivalent may be then described as a SPICE circuit description which is simulated to determine the time and frequency domain characteristics of the dynamic system.

摘要翻译： 公开了一种用于生成代表动态系统的行为的电路描述的方法和系统。 可以使用表示动态系统的状态空间模型来产生具有与动态系统的操作特性等效的操作特性的等效电子电路。 然后可以将电子电路等效物描述为SPICE电路描述，其被模拟以确定动态系统的时域和频域特性。

公开(公告)号：US20060262446A1

公开(公告)日：2006-11-23

申请号：US11438850

申请日：2006-05-23

申请人： Baris Posat ,  Kemal Ozanoglu ,  Alessandro Venca

发明人： Baris Posat ,  Kemal Ozanoglu ,  Alessandro Venca

IPC分类号： G11B5/02

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：US07099098B2

公开(公告)日：2006-08-29

申请号：US10349539

申请日：2003-01-22

申请人： Baris Posat ,  Kemal Ozanoglu ,  Alessandro Venca

发明人： Baris Posat ,  Kemal Ozanoglu ,  Alessandro Venca

IPC分类号： G11B5/09

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：US06970316B2

公开(公告)日：2005-11-29

申请号：US09991557

申请日：2001-11-09

申请人： Alessandro Venca ,  Baris Posat ,  Kemal Ozanoglu ,  Roberto Alini

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

IPC分类号： G11B5/09 ,  G11B5/00 ,  G11B5/012 ,  G11B5/02 ,  G11B15/12

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 includes switching circuitry connected between the terminals of the write head and reference voltage supplies, such as positive and negative voltage supplies. The driver circuit further includes timing circuitry 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向写入头提供在写入头中的稳态电流电平之间的转换期间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，驱动器电路包括连接在写入头的端子和参考电压源（例如正和负电压源）之间的开关电路。 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。

公开(公告)号：US07035028B2

公开(公告)日：2006-04-25

申请号：US10843823

申请日：2004-05-12

申请人： Alessandro Venca ,  Roberto Alini ,  Baris Posat

发明人： Alessandro Venca ,  Roberto Alini ,  Baris Posat

IPC分类号： G11B5/09

CPC分类号： G11B5/09 ,  G11B2005/0016 ,  H02M3/073

摘要： 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.

摘要翻译： 一个写入驱动器通过一个连接到写入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。 连接在高电压基准或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。 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期间进入反向偏置。

公开(公告)号：US20050254159A1

公开(公告)日：2005-11-17

申请号：US10843823

申请日：2004-05-12

申请人： Alessandro Venca ,  Roberto Alini ,  Baris Posat

发明人： Alessandro Venca ,  Roberto Alini ,  Baris Posat

IPC分类号： G11B5/09 ,  G05F3/26 ,  G11B5/00 ,  G11B5/02 ,  H02M3/07

CPC分类号： G11B5/09 ,  G11B2005/0016 ,  H02M3/073

摘要： 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.

摘要翻译： 一个写入驱动器通过一个连接到写入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。 连接在高电压基准或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。 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期间进入反向偏置。

公开(公告)号：US20050231843A1

公开(公告)日：2005-10-20

申请号：US10824096

申请日：2004-04-14

申请人： Alessandro Venca ,  Roberto Alini ,  Baris Posat

发明人： Alessandro Venca ,  Roberto Alini ,  Baris Posat

IPC分类号： G11B5/09 ,  G05F3/26 ,  G11B5/02 ,  H04L25/02

CPC分类号： G11B5/02

摘要： 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.

摘要翻译： 用于通过互连或柔性传输线连接到写入头的写入头来驱动写入电流的写入驱动器。 写驱动器包括将写驱动器的输出阻抗与互连的奇特特性阻抗匹配的电路，并且包括产生到写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，其操作以在互连的传输延迟的两倍的初始周期期间在输出电阻器上保持零电压降。

公开(公告)号：US07375909B2

公开(公告)日：2008-05-20

申请号：US10824096

申请日：2004-04-14

申请人： Alessandro Venca ,  Roberto Alini ,  Baris Posat

发明人： Alessandro Venca ,  Roberto Alini ,  Baris Posat

IPC分类号： G11B5/09

CPC分类号： G11B5/02

摘要： 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.

摘要翻译： 用于通过互连或柔性传输线连接到写入头的写入头来驱动写入电流的写入驱动器。 写驱动器包括将写驱动器的输出阻抗与互连的奇特特性阻抗匹配的电路，并且包括产生到写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，其操作以在互连的传输延迟的两倍的初始周期期间在输出电阻器上保持零电压降。

公开(公告)号：US07365928B2

公开(公告)日：2008-04-29

申请号：US11105174

申请日：2005-04-13

申请人： Alessandro Venca ,  Roberto Alini ,  Baris Posat

发明人： Alessandro Venca ,  Roberto Alini ,  Baris Posat

IPC分类号： G11B5/02

CPC分类号： G11B5/02 ,  G11B5/022 ,  G11B2005/0018 ,  H02M3/07

摘要： 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 pair of current sources, such as MOS transistors, connected to the input node of a single capacitor. During the overshoot duration, the current sources selectively operate at saturation to generate a pulsed current with an amplitude of half the load current. The recharge of the capacitor is done with the load current.

摘要翻译： 一个写入驱动器通过一个连接到写入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。 连接在高电压基准或电源电压和低电压基准之间的升压电路，并且包括连接到单个电容器的输入节点的一对电流源，例如MOS晶体管。 在过冲持续时间期间，电流源选择性地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。 电容器的充电由负载电流完成。