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公开(公告)号：US07564638B2
公开(公告)日：2009-07-21
申请号：US11438850
申请日：2006-05-23
Applicant: Baris Posat , Kemal Ozanoglu , Alessandro Venca
Inventor： Baris Posat , Kemal Ozanoglu , Alessandro Venca
IPC: G11B5/02
CPC classification number: 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
Abstract: 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.
Abstract translation: 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。
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公开(公告)号：US06944834B2
公开(公告)日：2005-09-13
申请号：US10349540
申请日：2003-01-22
Applicant: Baris Posat , Kemal Ozanoglu , Alessandro Venca
Inventor： Baris Posat , Kemal Ozanoglu , Alessandro Venca
CPC classification number: G06F17/5036
Abstract: 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.
Abstract translation: 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。
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Patent Agency Ranking
公开(公告)号：US07099098B2
公开(公告)日：2006-08-29
申请号：US10349539
申请日：2003-01-22
Applicant: Baris Posat , Kemal Ozanoglu , Alessandro Venca
Inventor： Baris Posat , Kemal Ozanoglu , Alessandro Venca
IPC: G11B5/09
CPC classification number: 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
Abstract: 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.
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公开(公告)号：US06970316B2
公开(公告)日：2005-11-29
申请号：US09991557
申请日：2001-11-09
Applicant: Alessandro Venca , Baris Posat , Kemal Ozanoglu , Roberto Alini
Inventor： Alessandro Venca , Baris Posat , Kemal Ozanoglu , Roberto Alini
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 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.
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。
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公开(公告)号：US07274523B2
公开(公告)日：2007-09-25
申请号：US10815135
申请日：2004-03-31
Applicant: Kemal Ozanoglu , Baris Posat , Roberto Allni
Inventor： Kemal Ozanoglu , Baris Posat , Roberto Allni
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。 前置放大器具有从读取头接收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通道，该读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。
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公开(公告)号：US20060262446A1
公开(公告)日：2006-11-23
申请号：US11438850
申请日：2006-05-23
Applicant: Baris Posat , Kemal Ozanoglu , Alessandro Venca
Inventor： Baris Posat , Kemal Ozanoglu , Alessandro Venca
IPC: G11B5/02
CPC classification number: 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
Abstract: 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.
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公开(公告)号：US20050219725A1
公开(公告)日：2005-10-06
申请号：US10815135
申请日：2004-03-31
Applicant: Kemal Ozanoglu , Baris Posat , Roberto Allni
Inventor： Kemal Ozanoglu , Baris Posat , Roberto Allni
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。 前置放大器具有从读取头接收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通道，该读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。
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