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公开(公告)号：US08014098B1
公开(公告)日：2011-09-06
申请号：US12843669
申请日：2010-07-26
IPC分类号： G11B5/02
CPC分类号： G11B5/012 , G11B5/09 , H03F3/45112 , H03F2203/45101 , H03F2203/45678
摘要： A circuit for providing a write current having a programmably adjustable duty cycle in a hard disk drive write channel has a differential pair gain circuit for receiving a data input signal and generating a differential output voltage to provide a differential write signal for generating the write current. First and second programmable current sources are connected to the differential pair gain circuit to create a programmable voltage offset of the differential output voltage to programmably adjust the duty cycle of the write current.
摘要翻译： 用于提供在硬盘驱动器写入通道中具有可编程调节占空比的写入电流的电路具有用于接收数据输入信号并产生差分输出电压以提供用于产生写入电流的差分写入信号的差分对增益电路。 第一和第二可编程电流源连接到差分对增益电路以产生差分输出电压的可编程电压偏移，以可编程地调整写入电流的占空比。
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2.发明授权Method to vary symmetry and coupling in symmetrical write drivers for disk driver preamplifiers 有权在磁盘驱动器前置放大器的对称写入驱动器中改变对称性和耦合的方法公开(公告)号：US07450329B2
公开(公告)日：2008-11-11
申请号：US10932240
申请日：2004-09-01
IPC分类号： G11B5/02
CPC分类号： H03F3/45089 , H03F3/45085 , H03F2203/45366 , H03F2203/45494 , H03F2203/45644
摘要： The present invention achieves technical advantages as a preamplifier write driver (10) having a varying common-mode output voltage. This varying common-mode output voltage also adjusts the derivative of the common-mode voltage, which is proportional to the amount of current coupled onto the MR head through parasitic capacitance. Currents of a first circuit (Q0,Q3) and a second circuit (Q1,Q2) are matched to overcome process variations and modeling errors. A pair of transresistance amplifiers (16) are driven by control lines (14) to achieve these matched currents.
摘要翻译： 本发明实现了具有变化的共模输出电压的前置放大器写入驱动器（10）的技术优点。 这种变化的共模输出电压还调节共模电压的导数，其与通过寄生电容耦合到MR头上的电流量成比例。 匹配第一电路（Q 0，Q 3）和第二电路（Q 1，Q 2）的电流以克服工艺变化和建模误差。 一对跨阻放大器（16）由控制线（14）驱动以实现这些匹配电流。
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3.发明申请METHOD AND CIRCUITRY FOR PROGRAMMABLY CONTROLLING DEGAUSS WRITE CURRENT DECAY IN HARD DISK DRIVES 有权方法和电路可编程控制硬盘驱动器中的写入电流衰减公开(公告)号：US20120105992A1
公开(公告)日：2012-05-03
申请号：US12939006
申请日：2010-11-03
IPC分类号： G11B5/02
CPC分类号： G11B5/465
摘要： A control circuit to provide a control current to control an amplitude of a write current in a magnetic media drive. The control circuit has an output circuit for providing the control current with an amplitude dependent on a bias voltage. A bias current path provides the bias voltage to the output circuit, and a current diverting circuit is connected to divert current from the bias current path. A programmable ramp voltage generator operates in response to a degauss enable signal, and a voltage-to-current converter receives the programmable ramp voltage to control the current diverting circuit to divert current from the bias current path at a rate determined by the programmable ramp voltage. The bias voltage and the write current decay according to the programmable ramp voltage. The write current decay can be made linear and independent of a beginning write current amplitude.
摘要翻译： 控制电路，用于提供控制电流以控制磁介质驱动器中的写入电流的幅度。 控制电路具有用于向控制电流提供取决于偏置电压的幅度的输出电路。 偏置电流路径将偏置电压提供给输出电路，并且连接电流转向电路以从偏置电流路径转移电流。 可编程斜坡电压发生器响应于消磁使能信号而工作，并且电压 - 电流转换器接收可编程斜坡电压以控制电流转向电路，以由可编程斜坡电压确定的速率偏置来自偏置电流通路的电流 。 偏置电压和写入电流根据可编程斜坡电压衰减。 写入电流衰减可以是线性的，与开始的写入电流幅度无关。
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4.发明申请公开(公告)号：US20080239558A1
公开(公告)日：2008-10-02
申请号：US12016046
申请日：2008-01-17
IPC分类号： G11B27/30
CPC分类号： G11B20/10194 , G11B5/02 , G11B2005/001 , G11B2220/2516
摘要： Methods and apparatus for controlling the duration of a pulse in a hard drive write system are disclosed. A disclosed method comprises generating a current pulse, reducing the current of the pulse and conveying a portion of the current pulse to a hard drive write system. In addition, a method is disclosed whereby a portion of the current pulse is truncated.
摘要翻译： 公开了一种用于控制硬盘驱动器写入系统中脉冲持续时间的方法和装置。 所公开的方法包括产生电流脉冲，减小脉冲的电流并将当前脉冲的一部分传送到硬盘驱动器写入系统。 此外，公开了一种当前脉冲的一部分被截断的方法。
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公开(公告)号：US20080265950A1
公开(公告)日：2008-10-30
申请号：US12102110
申请日：2008-04-14
IPC分类号： H03K3/01
CPC分类号： H03K19/01825
摘要： One embodiment of the invention includes a driver circuit. The driver circuit comprises a high-side switch that is activated in response to a positive driver input signal to provide a positive output signal at a driver output. The driver circuit also comprises a low-side switch that is activated in response to a negative driver input signal to provide a negative output signal at the driver output. The positive and negative driver input and output signals can be relative to respective cross-over magnitudes. The driver circuit further comprises at least one impedance-matching device configured to activate the low-side switch in response to a positive signal reflection at the driver output and to activate the high-side switch in response to a negative signal reflection at the driver output.
摘要翻译： 本发明的一个实施例包括驱动器电路。 驱动器电路包括响应于正驱动器输入信号而激活的高侧开关，以在驱动器输出端提供正输出信号。 驱动器电路还包括低侧开关，其响应于负驱动器输入信号被激活以在驱动器输出端提供负输出信号。 正负驱动器输入和输出信号可以相对于相应的交叉幅度。 驱动器电路还包括至少一个阻抗匹配装置，其被配置为响应于驱动器输出处的正信号反射而激活低侧开关，并且响应于驱动器输出处的负信号反射而激活高侧开关 。
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6.发明申请METHODS AND APPARATUS FOR TEMPERATURE COMPENSATION FOR HARD DISK DRIVE WRITE OVERSHOOT CURRENT 有权用于硬盘驱动写入过电流的温度补偿方法和装置公开(公告)号：US20080239563A1
公开(公告)日：2008-10-02
申请号：US12016026
申请日：2008-01-17
IPC分类号： G11B33/14
CPC分类号： G11B19/046 , G11B5/02 , G11B5/40 , G11B2005/001
摘要： Methods and apparatus for temperature compensation for hard disk drive writer overshoot current are disclosed. A disclosed system comprises creating a first delay based on the temperature of the hard disk drive, creating a second delay based on the temperature of the hard disk drive, and creating a pulse based on the first and second delay.
摘要翻译： 公开了用于硬盘驱动器写入器过冲电流的温度补偿的方法和装置。 所公开的系统包括基于硬盘驱动器的温度创建第一延迟，基于硬盘驱动器的温度产生第二延迟，以及基于第一和第二延迟创建脉冲。
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公开(公告)号：US20080239543A1
公开(公告)日：2008-10-02
申请号：US12016009
申请日：2008-01-17
IPC分类号： G11B20/22
CPC分类号： G11B5/02 , G11B20/10009 , G11B2005/0013 , G11B2220/2516
摘要： Methods and apparatus for generating a hard drive write signal are here in disclosed. A disclosed method comprises generating a hard drive write signal on an output of a switch based on an edge of the first control signal and reducing the hard drive write signal based on an edge of a second control signal via a second switch.
摘要翻译： 在此公开了用于产生硬盘驱动器写入信号的方法和装置。 所公开的方法包括：基于第一控制信号的边缘在开关的输出上产生硬盘驱动器写入信号，并且经由第二开关基于第二控制信号的边沿减少硬盘驱动器写入信号。
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8.发明申请High Speed, Low Power Write Current Switching Scheme for HDD Preamplifier 有权用于HDD前置放大器的高速，低功耗写入电流切换方案公开(公告)号：US20130278335A1
公开(公告)日：2013-10-24
申请号：US13570429
申请日：2012-08-09
CPC分类号： H03F3/45085 , G11B5/022 , H03F2203/45654
摘要： A hard drive write preamplifier includes a first differential pair of PNP BJTs having a first PNP BJT and a second PNP BJT; a first tail current source coupled into emitter of the PNP BJTs of the first differential pair; a second differential pair of NPN BJTs having a first NPN BJT and a second NPN BJT; a second tail current source coupled into the emitters of the NPN BJTs of the second differential pair; wherein a collector of each of the PNP BJTs of the first differential pair are coupled to a corresponding collector the NPN BJTs of the second differential pair; a first shift up PNP BJT having emitter coupled to the collector of a first PNP BJT of the first differential pair; a second shift up PNP BJT having an emitter coupled to the collector of the second PNP BJT of the first differential pair.
摘要翻译： 硬盘写入前置放大器包括具有第一PNP BJT和第二PNP BJT的PNP BJT的第一差分对; 耦合到所述第一差分对的PNP BJT的发射极的第一尾电流源; 具有第一NPN BJT和第二NPN BJT的NPN BJT的第二差分对; 耦合到第二差分对的NPN BJT的发射极的第二尾电流源; 其中所述第一差分对的所述PNP BJT中的每一个的集电极耦合到所述第二差分对的NPN BJT的对应集电极; 第一偏移PNP BJT具有耦合到第一差分对的第一PNP BJT的集电极的发射极; 第二偏移PNP BJT具有耦合到第一差分对的第二PNP BJT的集电极的发射极。
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9.发明授权Method and circuitry for programmably controlling degauss write current decay in hard disk drives 有权用于可编程控制硬盘驱动器中消磁写入电流衰减的方法和电路公开(公告)号：US08503127B2
公开(公告)日：2013-08-06
申请号：US12939006
申请日：2010-11-03
CPC分类号： G11B5/465
摘要： A control circuit to provide a control current to control an amplitude of a write current in a magnetic media drive. The control circuit has an output circuit for providing the control current with an amplitude dependent on a bias voltage. A bias current path provides the bias voltage to the output circuit, and a current diverting circuit is connected to divert current from the bias current path. A programmable ramp voltage generator operates in response to a degauss enable signal, and a voltage-to-current converter receives the programmable ramp voltage to control the current diverting circuit to divert current from the bias current path at a rate determined by the programmable ramp voltage. The bias voltage and the write current decay according to the programmable ramp voltage. The write current decay can be made linear and independent of a beginning write current amplitude.
摘要翻译： 控制电路，用于提供控制电流以控制磁介质驱动器中的写入电流的幅度。 控制电路具有用于向控制电流提供取决于偏置电压的幅度的输出电路。 偏置电流路径将偏置电压提供给输出电路，并且连接电流转向电路以从偏置电流路径转移电流。 可编程斜坡电压发生器响应于消磁使能信号而工作，并且电压 - 电流转换器接收可编程斜坡电压以控制电流转向电路，以由可编程斜坡电压确定的速率偏置来自偏置电流通路的电流 。 偏置电压和写入电流根据可编程斜坡电压衰减。 写入电流衰减可以是线性的，与开始的写入电流幅度无关。
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公开(公告)号：US08305704B2
公开(公告)日：2012-11-06
申请号：US12102106
申请日：2008-04-14
摘要： One embodiment of the invention includes a system for writing data onto a magnetic disk. An output driver provides a first write current through a first output transistor in a first state and provides a second write current through a second output transistor in a second state. The first and second write currents can be provided to a disk write head to store opposing binary values, respectively. A bias current generator switches a first bias current between an intermediate voltage node in the second state and the first control node in the first state, and switches a second bias current between the intermediate voltage node in the first state and the second control node in the second state. The first and second bias currents can be provided to set a bias voltage at the first and second control nodes to bias the first and second output transistors, respectively.
摘要翻译： 本发明的一个实施例包括一种将数据写入磁盘的系统。 输出驱动器以第一状态提供通过第一输出晶体管的第一写入电流，并且在第二状态下通过第二输出晶体管提供第二写入电流。 可以将第一和第二写入电流提供给磁盘写入头以分别存储相对的二进制值。 偏置电流发生器在第二状态的中间电压节点与第一状态的第一控制节点之间切换第一偏置电流，并且在第一状态的中间电压节点与第二状态的第二控制节点之间切换第二偏置电流 第二个状态。 可以提供第一和第二偏置电流以设置第一和第二控制节点处的偏置电压，以分别偏置第一和第二输出晶体管。
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