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    Dynamically programmable magneto-resistive head write and read bias currents
    1.
    发明授权
    Dynamically programmable magneto-resistive head write and read bias currents 失效
    动态可编程磁阻头读写偏置电流

    公开(公告)号：US06288863B1

    公开(公告)日：2001-09-11

    申请号：US09557247

    申请日：2000-04-24

    申请人： Jack W. Flinsbaugh

    发明人： Jack W. Flinsbaugh

    IPC分类号： G11B503

    CPC分类号： B82Y25/00 ,  B82Y10/00 ,  G11B5/012 ,  G11B5/02 ,  G11B5/035 ,  G11B15/026 ,  G11B2005/0018 ,  G11B2005/3996

    摘要： Apparatus and method for dynamically programming the magnitude of read bias and write currents in a disc drive head (30A, 30B). A digital input value is provided to a register (80) of a digital to analog converter (76, 78), the digital input value indicative of the desired magnitude of the head current. A multiplier (82) of the digital to analog converter (76, 78) multiplies the digital input value by a reference voltage to generate an output voltage. The differential voltage between the reference voltage and the output voltage controls the source to drain resistance of a transistor (106) connected in series with a preamp voltage source (114, 120) of a preamp circuit (70). By inputting different digital input values, the source to drain resistance of the transistor (106), and hence the magnitude of the current generated by the preamp voltage source (114, 120), are precisely controlled. The magnitude of the head current is provided as a multiple of the magnitude of the current generated by the preamp voltage source (114, 120). During a read operation, the read bias current is provided to the head (30A, 30B) and the effects of flux transitions on the read bias current are decoded by a read channel (68) to retrieve the data stored on the disc drive. During a write operation, the polarity of the write current is controlled by a write channel circuit (66) operating in conjunction with the preamp circuit (70) to write the data to the disc (16A, 16B).

    摘要翻译： 用于在盘驱动头（30A，30B）中动态地编程读偏置和写电流的大小的装置和方法。 将数字输入值提供给数模转换器（76,78）的寄存器（80），该数字输入值表示磁头电流的期望幅度。 数模转换器（76,78）的乘法器（82）将数字输入值乘以参考电压以产生输出电压。 参考电压和输出电压之间的差分电压控制与前置放大电路（70）的前置放大器电压源（114,120）串联连接的晶体管（106）的源极到漏极电阻。 通过输入不同的数字输入值，精确地控制晶体管（106）的源极到漏极电阻以及因此由前置放大器电压源（114,120）产生的电流的大小。 磁头电流的大小被提供为由前置放大器电压源（114,120）产生的电流的大小的倍数。 在读取操作期间，将读取的偏置电流提供给磁头（30A，30B），并且读取偏置电流的磁通转换效应由读取通道（68）解码，以检索存储在磁盘驱动器上的数据。 在写入操作期间，写入电流的极性由与前置放大器电路（70）一起操作的写入通道电路（66）来控制，以将数据写入盘（16A，16B）。

    Dynamically programmable magneto-resistive head write and read bias currents
    2.
    发明授权
    Dynamically programmable magneto-resistive head write and read bias currents 失效
    动态可编程磁阻头读写偏置电流

    公开(公告)号：US6122127A

    公开(公告)日：2000-09-19

    申请号：US849332

    申请日：1997-06-04

    申请人： Jack W. Flinsbaugh

    发明人： Jack W. Flinsbaugh

    IPC分类号： G11B5/00 ,  G11B5/012 ,  G11B5/035 ,  G11B19/04 ,  G11B5/03 ,  G11B5/02 ,  G11B5/09

    CPC分类号： G11B19/04 ,  G11B5/012 ,  G11B2005/0016 ,  G11B2005/0018 ,  G11B5/035

    摘要： Apparatus and method for dynamically programmiing the magnitude of read bias and write currents in a disc drive head. A digital input value is provided to a register of a digital to analog converter, the digital input value indicative of the desired magnitude of the head current. A multiplier of the digital to analog converter multiplies the digital input value by a reference voltage to generate an output voltage. The differential voltage between the reference voltage and the output voltage controls the source to drain resistance of a transistor connected in series with a preamp voltage source of a preamp circuit. By inputting different digital input values, the source to drain resistance of the transistor, and hence the magnitude of the current generated by the preamp voltage source, are precisely controlled. The magnitude of the head current is provided as a multiple of the magnitude of the current generated by the preamp voltage source. During a read operation, the read bias current is provided to the head and the effects of flux trasitions on the read bias current are decoded by a read channel to retrieve the data stored on the disc drive. During a write operation, the polarity of the write current is controlled by a write channel circuit operating in conjunction with the preamp circuit to write the data to the disc.

    摘要翻译： PCT No.PCT / US95 / 17028 Sec。 371日期：1997年6月4日 102（e）日期1997年6月4日PCT 1995年12月28日PCT PCT。 公开号WO97 / 09714 日期1997年3月13日用于在盘驱动头中动态地编程读取偏置和写入电流的大小的装置和方法。 将数字输入值提供给数模转换器的寄存器，数字输入值指示磁头电流的期望幅度。 数模转换器的乘法器将数字输入值乘以参考电压以产生输出电压。 参考电压和输出电压之间的差分电压控制与前置放大器电路的前置放大器电压源串联连接的晶体管的源极到漏极电阻。 通过输入不同的数字输入值，精确地控制晶体管的源极到漏极电阻以及因此由前置放大器电压源产生的电流的大小。 磁头电流的大小被提供为由前置放大器电压源产生的电流的大小的倍数。 在读取操作期间，将读取的偏置电流提供给磁头，并且读取偏置电流的磁通量跟踪的影响由读取通道解码以检索存储在磁盘驱动器上的数据。 在写入操作期间，写入电流的极性由写入通道电路控制，写入通道电路与前置放大器电路一起工作，以将数据写入光盘。