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1. 发明授权

US06735034B1 Relative timing sequence for reader amplifiers 有权
标题翻译：读卡器放大器的相对时序
公开(公告)号：US06735034B1
公开(公告)日：2004-05-11
申请号：US09599176
申请日：2000-06-22
申请人： Ashish Manjrekar , Echere Iroaga , Bryan Bloodworth , Paul Merle Emerson
发明人： Ashish Manjrekar , Echere Iroaga , Bryan Bloodworth , Paul Merle Emerson
IPC分类号： G11B1512
CPC分类号： G11B20/10027 , G11B5/012 , G11B5/02 , G11B20/10009 , G11B2005/001 , G11B2005/0013
摘要： A method and circuit for selectively timing amplifier stages of a multi-stage reader amplifier for a hard disk drive system. The reader amplifier includes a first stage, second stage and third stage coupled in series. The method includes the steps of powering the first stage, delaying the enabling of the second stage, and delaying the enabling of the third stage, in order to reduce excursions on the third stage output signal. The circuit includes a logic circuit for successively enabling the second and third amplifier stages.
摘要翻译：一种用于选择性地为硬盘驱动器系统的多级读取器放大器的放大器级定时的方法和电路。阅读器放大器包括串联耦合的第一级，第二级和第三级。该方法包括以下步骤：对第一级供电，延迟第二级的使能，并延迟第三级的使能，以减少第三级输出信号的偏移。电路包括用于连续启用第二和第三放大器级的逻辑电路。

2. 发明授权

US06751034B1 Preamplifier read recovery parade 有权
标题翻译：前置放大器读取恢复游行
公开(公告)号：US06751034B1
公开(公告)日：2004-06-15
申请号：US09618684
申请日：2000-07-19
申请人： Bryan E. Bloodworth , Ashish Manjrekar , Echere Iroaga
发明人： Bryan E. Bloodworth , Ashish Manjrekar , Echere Iroaga
IPC分类号： G11B509
CPC分类号： G11B19/04 , G11B5/012 , G11B20/10 , G11B20/10009 , G11B2005/001 , G11B2005/0016 , G11B2005/0018
摘要： The present invention relates to a method of enhancing a preamplifier read recovery in a hard disk drive system and comprises the steps of determining whether the hard disk drive system is transitioning from a non-read state to a read state and initiating a non-read state to a read state transition sequence when a transition from the non-read state to the read state is determined. The transition sequence is independent of a type of non-read state prior to the transitioning. After the non-read state to read state transition sequence is complete the read mode is initiated. In addition, the invention comprises a system for controlling a transition from a non-read state to a read state associated with a preamplifier in a hard disk drive system. The system comprises a detection circuit operable to detect a completion of the non-read state and a non-read state to read state circuit operable to execute a series of events to transition from the non-read state to the read state, wherein the series of events is the same regardless of a type of non-read state. Further, the system comprises a read state initiation circuit operable to initiate the read state after the execution of the series of events.
摘要翻译：本发明涉及一种增强硬盘驱动器系统中前置放大器读取恢复的方法，包括以下步骤：确定硬盘驱动器系统是否从非读取状态转换到读取状态，并启动非读取状态当从非读取状态到读取状态的转变被确定时，读取状态转换序列。转换序列与转换之前的非读取状态类型无关。在读取状态转换序列的非读取状态完成后，读取模式被启动。此外，本发明包括一种用于控制从硬盘驱动器系统中的与非读取状态到与前置放大器相关联的读取状态的转换的系统。该系统包括检测电路，其可操作以检测非读取状态的完成和非读取状态，以读取状态电路，其可操作以执行一系列事件以从非读取状态转换到读取状态，其中该系列的事件是相同的，不管一种类型的非读取状态。此外，该系统包括读取状态发起电路，其可操作以在执行一系列事件之后启动读取状态。

3. 发明授权

US06856481B2 Apparatus and method for providing a read signal for an information processing device 有权
标题翻译：一种用于为信息处理装置提供读取信号的装置和方法
公开(公告)号：US06856481B2
公开(公告)日：2005-02-15
申请号：US10298806
申请日：2002-11-18
申请人： Ashish Manjrekar , Patrick Michael Teterud , Indumini Ranmuthu , Echere Iroaga
发明人： Ashish Manjrekar , Patrick Michael Teterud , Indumini Ranmuthu , Echere Iroaga
IPC分类号： G11B5/02 , G11B20/10 , G11B5/09
CPC分类号： G11B20/10009 , G11B5/02
摘要： An apparatus for providing a read signal at an output locus for access by an information processing device receives an input signal containing the information; the apparatus includes: (a) a read signal control unit receiving the input signal at a control unit input locus; the control unit is coupled with the output locus and controls the read signal; (b) a plurality of switches; and (c) a plurality of bias arrays coupled with the switches. A first bias array set cooperates with the plurality of switches in a first orientation to couple the first bias array set with the control unit to establish a first operational mode. A second bias array set cooperates with the plurality of switches in a second orientation to couple the second bias array set with the control unit to establish a second operational mode.
摘要翻译：一种用于在输出轨迹处提供读信号以供信息处理设备访问的装置接收包含该信息的输入信号; 该装置包括：（a）读取信号控制单元，其在控制单元输入轨迹处接收输入信号; 控制单元与输出轨迹耦合并控制读取信号; （b）多个开关; 和（c）与开关耦合的多个偏置阵列。第一偏置阵列组以第一方向与多个开关配合，以将第一偏置阵列组与控制单元耦合以建立第一操作模式。第二偏置阵列组以第二方向与多个开关配合，以将第二偏置阵列组与控制单元耦合以建立第二操作模式。

4. 发明授权

US06587296B1 Capacitor bias recovery methodology 有权
标题翻译：电容偏置恢复方法
公开(公告)号：US06587296B1
公开(公告)日：2003-07-01
申请号：US09621200
申请日：2000-07-21
申请人： Echere Iroaga , Ashish Manjrekar , Bryan E. Bloodworth
发明人： Echere Iroaga , Ashish Manjrekar , Bryan E. Bloodworth
IPC分类号： G11B1512
CPC分类号： G11B5/4984
摘要： A preamplifier circuit for a hard disk drive system comprises a preamplifier circuit having a bias voltage circuit stage associated therewith. The preamplifier circuit further comprises a current bias boost recovery circuit operatively coupled to the bias voltage circuit stage which is configured to increase a rate of charging of a noise reduction capacitor associated with the bias voltage circuit stage. A head select boost recovery circuit is also operatively coupled to the bias voltage circuit and is configured to increase a rate of charging or discharging of a bias capacitor associated with the bias voltage circuit stage. Together the circuits allow for a concurrent head switch and current bias switch and avoids the problems associated with the prior art.
摘要翻译：用于硬盘驱动系统的前置放大器电路包括具有与其相关联的偏置电压电路级的前置放大器电路。前置放大器电路还包括可操作地耦合到偏置电压电路级的电流偏置升压恢复电路，其被配置为增加与偏置电压电路级相关联的降噪电容器的充电速率。头部选择升压恢复电路还可操作地耦合到偏置电压电路，并且被配置为增加与偏置电压电路级相关联的偏置电容器的充电或放电的速率。这些电路一起允许同时的头开关和电流偏置开关，并且避免了与现有技术相关的问题。

5. 发明授权

US06522492B1 Write to read switching time trim circuit 有权
标题翻译：写入读取开关时间调整电路
公开(公告)号：US06522492B1
公开(公告)日：2003-02-18
申请号：US09707877
申请日：2000-11-07
申请人： Indumini Ranmuthu , Echere Iroaga , Ashish Manjrekar
发明人： Indumini Ranmuthu , Echere Iroaga , Ashish Manjrekar
IPC分类号： G11B502
CPC分类号： G11B20/10 , G11B5/012 , G11B5/02 , G11B2005/0013
摘要： An offset circuit to correct an offset between differential signals includes a read circuit to read the differential signals, a circuit to measure the offset of the differential signals, and a programmable trim circuit to compensate for the offset of said differential signals.
摘要翻译：用于校正差分信号之间的偏移的偏移电路包括读取差分信号的读取电路，用于测量差分信号的偏移的电路以及用于补偿所述差分信号的偏移的可编程微调电路。

6. 发明授权

US06594101B1 Read head protection circuit and method 有权
标题翻译：读头保护电路及方法
公开(公告)号：US06594101B1
公开(公告)日：2003-07-15
申请号：US09599474
申请日：2000-06-22
申请人： Echere Iroaga , Bryan E. Bloodworth , Ashish Manjrekar
发明人： Echere Iroaga , Bryan E. Bloodworth , Ashish Manjrekar
IPC分类号： G11B502
CPC分类号： G11B5/40 , G11B5/012 , G11B5/488 , G11B2005/0008 , G11B2005/0016
摘要： A circuit (80) and method (84) for protecting read heads (18) of a hard-disk drive system (100). Capacitor C1 is controllably coupled to a dummy head Rdummy during a Vbias mode, so that capacitor C1 has a low, predictable voltage upon returning to Ibias mode, protecting the read heads (18) from damage. The circuit (80) includes logic (82) and algorithm (84) determining when to couple the capacitor C1 to the dummy head Rdummy during a servo bank write (SBW) sequence.
摘要翻译：一种用于保护硬盘驱动器系统（100）的读取头（18）的电路（80）和方法（84）。电容器C1在Vbias模式期间可控地耦合到虚拟磁头Rdummy，使得电容器C1在返回到Ibias模式时具有低的可预测的电压，从而保护读取磁头（18）免受损坏。电路（80）包括逻辑（82）和算法（84），用于确定何时在伺服组写入（SBW）序列期间将电容器C1耦合到虚拟磁头Rdummy。

7. 发明授权

US07889452B2 Hard disk drive preamplifier timers and methods to calibrate hard disk drive preamplifier timers 有权
标题翻译：硬盘驱动器前置放大器定时器和校准硬盘驱动器前置放大器定时器的方法
公开(公告)号：US07889452B2
公开(公告)日：2011-02-15
申请号：US12059690
申请日：2008-03-31
申请人： Bryan E. Bloodworth , Nilakantan Seshan , Benjamin Sarpong , Ashish Manjrekar
发明人： Bryan E. Bloodworth , Nilakantan Seshan , Benjamin Sarpong , Ashish Manjrekar
IPC分类号： G11B15/12 , G11B5/09 , G11B5/02
CPC分类号： G11B5/09 , G11B20/10194 , G11B2220/2516
摘要： Hard disk drive preamplifier timers and methods to calibrate hard disk drive preamplifier timers are disclosed. A timer in a hard disk drive preamplifier comprises a first switch to selectively store charge in a storage device based on an input signal, the storage device receiving a first current and storing the charge to cause the storage device to have a first voltage that increases at a first rate; a compensation device to cause the first voltage to be substantially equal to a second voltage after a predetermined time period; and a trigger to output a signal when the first voltage is substantially equal to the second voltage, the predetermined time period controlling a transition time between a first hard disk drive operating condition and a second hard disk drive operating condition different than the first operating condition.
摘要翻译：公开了用于校准硬盘驱动器前置放大器定时器的硬盘驱动器前置放大器定时器和方法。硬盘驱动器前置放大器中的定时器包括：第一开关，用于基于输入信号选择性地将电荷存储在存储装置中，所述存储装置接收第一电流并存储电荷以使存储装置具有在第一率; 补偿装置，用于在预定时间段之后使所述第一电压基本上等于第二电压; 以及当所述第一电压基本上等于所述第二电压时输出信号的触发器，所述预定时间段控制第一硬盘驱动器操作条件和与所述第一操作条件不同的第二硬盘驱动器操作条件之间的转换时间。

8. 发明申请

US20090244758A1 Hard Disk Drive Preamplifier Timers and Methods to Calibrate Hard Disk Drive Preamplifier Timers 有权
标题翻译：硬盘驱动器前置放大器定时器和校准硬盘驱动器前置放大器定时器的方法
公开(公告)号：US20090244758A1
公开(公告)日：2009-10-01
申请号：US12059690
申请日：2008-03-31
申请人： Bryan E. Bloodworth , Nilakantan Seshan , Benjamin Sarpong , Ashish Manjrekar
发明人： Bryan E. Bloodworth , Nilakantan Seshan , Benjamin Sarpong , Ashish Manjrekar
IPC分类号： G11B5/09
CPC分类号： G11B5/09 , G11B20/10194 , G11B2220/2516
摘要： Hard disk drive preamplifier timers and methods to calibrate hard disk drive preamplifier timers are disclosed. A timer is in a hard disk drive preamplifier comprises a first switch to selectively store charge in a storage device based on an input signal, the storage device receiving a first current and storing the charge to cause the storage device to have a first voltage that increases at a first rate; a compensation device to cause the first voltage to be substantially equal to a second voltage after a predetermined time period; and a trigger to output a signal when the first voltage is substantially equal to the second voltage, the predetermined time period controlling a transition time between a first hard disk drive operating condition and a second hard disk drive operating condition different than the first operating condition.
摘要翻译：公开了用于校准硬盘驱动器前置放大器定时器的硬盘驱动器前置放大器定时器和方法。硬盘驱动器前置放大器中的定时器包括第一开关，用于基于输入信号选择性地将电荷存储在存储装置中，所述存储装置接收第一电流并存储电荷以使存储装置具有增加的第一电压以一率; 补偿装置，用于在预定时间段之后使所述第一电压基本上等于第二电压; 以及当所述第一电压基本上等于所述第二电压时输出信号的触发器，所述预定时间段控制第一硬盘驱动器操作条件和与所述第一操作条件不同的第二硬盘驱动器操作条件之间的转换时间。

9. 发明授权

US07675706B2 Methods and apparatus for proximity detection of hard disk drive read heads 有权
标题翻译：用于硬盘读取头的接近检测的方法和装置
公开(公告)号：US07675706B2
公开(公告)日：2010-03-09
申请号：US12039300
申请日：2008-02-28
申请人： Rajkumar Jayaraman , Taras Dudar , Seungwoo Jung , Ashish Manjrekar
发明人： Rajkumar Jayaraman , Taras Dudar , Seungwoo Jung , Ashish Manjrekar
IPC分类号： G11B21/02 , G11B27/36
CPC分类号： G11B5/6005 , G11B5/582
摘要： Methods and apparatus for proximity detection of hard disk drive read heads are disclosed. A disclosed method comprises forming a first signal having a frequency, a first amplitude, and a first offset voltage, forming a second offset voltage substantially equal to the first offset voltage from the first signal, amplifying the amplitude of the first signal to cause the resonant signal to have a second amplitude greater than the first, and forming a second signal having a frequency indicative of the location of a read head relative to a platter of a hard disk drive.
摘要翻译：公开了用于硬盘驱动器读取头的接近检测的方法和装置。所公开的方法包括形成具有频率，第一幅度和第一偏移电压的第一信号，从第一信号形成基本上等于第一偏移电压的第二偏移电压，放大第一信号的振幅以引起谐振信号具有大于第一幅度的第二幅度，以及形成具有指示读取头相对于硬盘驱动器的盘的位置的频率的第二信号。

10. 发明申请

US20090219650A1 METHODS AND APPARATUS FOR PROXIMITY DETECTION OF HARD DISK DRIVE READ HEADS 有权
标题翻译：硬盘读取头接近检测的方法和装置
公开(公告)号：US20090219650A1
公开(公告)日：2009-09-03
申请号：US12039300
申请日：2008-02-28
申请人： Rajkumar Jayaraman , Taras Dudar , Seungwoo Jung , Ashish Manjrekar
发明人： Rajkumar Jayaraman , Taras Dudar , Seungwoo Jung , Ashish Manjrekar
IPC分类号： G11B15/60
CPC分类号： G11B5/6005 , G11B5/582
摘要： Methods and apparatus for proximity detection of hard disk drive read heads are disclosed. A disclosed method comprises forming a first signal having a frequency, a first amplitude, and a first offset voltage, forming a second offset voltage substantially equal to the first offset voltage from the first signal, amplifying the amplitude of the first signal to cause the resonant signal to have a second amplitude greater than the first, and forming a second signal having a frequency indicative of the location of a read head relative to a platter of a hard disk drive.
摘要翻译：公开了用于硬盘驱动器读取头的接近检测的方法和装置。所公开的方法包括形成具有频率，第一幅度和第一偏移电压的第一信号，从第一信号形成基本上等于第一偏移电压的第二偏移电压，放大第一信号的振幅以引起谐振信号具有大于第一幅度的第二幅度，以及形成具有指示读取头相对于硬盘驱动器的盘的位置的频率的第二信号。

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