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1. 发明专利

JP2005327452A Disk drive write driver with boosting circuit to improve output voltage swing 审中-公开
标题翻译：带升压电路的磁盘驱动器驱动器，以提高输出电压摆幅
公开(公告)号：JP2005327452A
公开(公告)日：2005-11-24
申请号：JP2005139508
申请日：2005-05-12
申请人： Stmicroelectronics Inc , エスティーマイクロエレクトロニクス,インコーポレイテッドSTMicroelectronics,Inc
发明人： ALINI ROBERTO , POSAT BARIS , VENCA ALESANDRO
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： PROBLEM TO BE SOLVED: To provide an improved circuit and method for driving a write head in a hard disk drive (HDD) system.
SOLUTION: 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 is 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.
COPYRIGHT: (C)2006,JPO&NCIPI
摘要翻译：要解决的问题：提供用于驱动硬盘驱动器（HDD）系统中的写入头的改进的电路和方法。解决方案：写入驱动器包括匹配输出电阻到互连的奇特性阻抗的电路和升压电路。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，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。版权所有（C）2006，JPO＆NCIPI

2. 发明专利

JP2005293829A Read head preamplifier with thermal asperity transient control 审中-公开
标题翻译：阅读具有热平衡瞬态控制的头部前置放大器
公开(公告)号：JP2005293829A
公开(公告)日：2005-10-20
申请号：JP2005099165
申请日：2005-03-30
申请人： Stmicroelectronics Inc , エスティーマイクロエレクトロニクス,インコーポレイテッドSTMicroelectronics,Inc
发明人： POSAT BARIS , ALINI ROBERTO , OZANOGLU KEMAL
IPC分类号： G11B5/09 , G11B5/00 , G11B20/10 , G11B20/22
CPC分类号： G11B20/10009 , G11B20/22 , G11B2005/0016
摘要： PROBLEM TO BE SOLVED: To correct for thermal asperity transients occurring in a hard disk drive.
SOLUTION: The preamplifier 110 has an input gain stage receiving a signal from an MR head 128, a thermal asperity transient correcting circuit 111, and an output buffer outputting a reader output to a read channel. The thermal asperity transient correcting circuit 111 is composed of a high-pass filter and voltage controlled based upon 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.
COPYRIGHT: (C)2006,JPO&NCIPI
摘要翻译：要解决的问题：纠正在硬盘驱动器中出现的热凹凸瞬变。解决方案：前置放大器110具有接收来自MR头128的信号的输入增益级，热凹凸瞬变校正电路111和将读取器输出输出到读通道的输出缓冲器。热绝缘瞬态校正电路111由高通滤波器和基于来自滤波器控制器的输入控制信号进行电压控制而组成。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。版权所有（C）2006，JPO＆NCIPI

3. 发明专利

JP2005302286A Write driver with power optimization and interconnect impedance matching 审中-公开
标题翻译：具有功率优化和互连阻塞匹配的写驱动器
公开(公告)号：JP2005302286A
公开(公告)日：2005-10-27
申请号：JP2005117072
申请日：2005-04-14
申请人： Stmicroelectronics Inc , エスティーマイクロエレクトロニクス,インコーポレイテッドSTMicroelectronics,Inc
发明人： VENCA ALESANDRO , ALINI ROBERTO , POSAT BARIS
IPC分类号： G11B5/09 , G05F3/26 , G11B5/02 , H04L25/02
CPC分类号： G11B5/02
摘要： PROBLEM TO BE SOLVED: To improve a write head in a hard disk drive system by providing impedance matching and a power amplification effect.
SOLUTION: A write driver for driving a write current through a write head connected to the write head by an interconnect or flexible transmission line is provided. 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.
COPYRIGHT: (C)2006,JPO&NCIPI
摘要翻译：要解决的问题：通过提供阻抗匹配和功率放大效果来改善硬盘驱动器系统中的写入头。解决方案：提供一种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。版权所有（C）2006，JPO＆NCIPI

4. 发明专利

JP2004229300A Preamplifier circuit for disk drive device and method thereof 审中-公开
公开(公告)号：JP2004229300A
公开(公告)日：2004-08-12
申请号：JP2004013875
申请日：2004-01-22
申请人： Stmicroelectronics Inc , エスティーマイクロエレクトロニクス,インコーポレイテッド STMicroelectronics,Inc
发明人： POSAT BARIS , OZANOGLU KEMAL , VENCA ALESANDRO
IPC分类号： G11B5/09 , G11B5/00 , G11B5/012 , G11B5/035 , G11B20/10 , H03F1/42 , 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： PROBLEM TO BE SOLVED: To provide a preamplifier circuit having necessary operating characteristics required for the effective operation of a disk drive employing a vertical recording technology.
SOLUTION: The amplifier for amplifying an electrical signal such as an electrical signal generated by a read head of the disk drive and a method are provided. The circuit includes a pair of cross-linked differential amplifier circuits. Each differential amplifier circuit is asymmetrical and includes two input transistors of different transistor types. For example, a bipolar transistor can be applied to a first one of the two input transistors of the differential amplifier circuits and a field effect transistor can be applied to a second one of the two input transistors. A relatively wide operating frequency range is obtained by using an asymmetric differential amplifier circuit.
COPYRIGHT: (C)2004,JPO&NCIPI

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