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1. 发明授权

US07339760B2 Integrated bias and offset recovery amplifier 有权
标题翻译：集成偏置和偏移恢复放大器
公开(公告)号：US07339760B2
公开(公告)日：2008-03-04
申请号：US10955775
申请日：2004-09-30
申请人： Jeffrey A. Gleason , John D. Leighton , Scott M. O'Brien
发明人： Jeffrey A. Gleason , John D. Leighton , Scott M. O'Brien
IPC分类号： G11B5/02
CPC分类号： G11B5/02 , G11B2005/0016 , G11B2005/0018 , H03F3/456 , H03F3/45748
摘要： A preamplifier circuit is connected to a transducing head, and has integrated bias circuitry and offset recovery circuitry. The offset recovery circuitry is activated in response to a transition from write mode to read more to provide an output signal representative of a signal across the transducing head. The bias circuitry is driven by the output signal of the offset recovery circuitry to bias the transducing head.
摘要翻译：前置放大器电路连接到转换头，并具有集成偏置电路和偏移恢复电路。偏移恢复电路响应于从写入模式的转变而被读取更多，以提供表示跨导头的信号的输出信号。偏置电路由偏移恢复电路的输出信号驱动以偏置换能头。

2. 发明授权

US07626777B2 Variable threshold bipolar signal peak detector 有权
标题翻译：可变阈值双极信号峰值检测器
公开(公告)号：US07626777B2
公开(公告)日：2009-12-01
申请号：US11234840
申请日：2005-09-23
申请人： Arvind R. Aemireddy , Ronen Malka , Jeffrey A. Gleason , Scott M. O'Brien
发明人： Arvind R. Aemireddy , Ronen Malka , Jeffrey A. Gleason , Scott M. O'Brien
IPC分类号： G11B5/02 , G11B27/36
CPC分类号： G11B5/09 , G11B20/10203 , G11B2220/2516 , H03F1/52 , H03F3/45197 , H03F3/45475 , H03F2200/435 , H03F2200/447 , H03F2200/78 , H03F2203/45074
摘要： A method and apparatus for detecting signal peaks caused by a thermal asperity event in a magnetic recording media to reduce data reading errors introduced by the thermal asperity event. A common mode voltage is determined for differential signals representing data bits read from the magnetic recording media and a threshold voltage produced responsive to the common mode voltage. A comparator determines if either of the differential signals exceeds the threshold voltage, thereby indicating the occurrence of a thermal asperity event.
摘要翻译：一种用于检测由磁记录介质中的热不平坦事件引起的信号峰值的方法和装置，以减少由热不平坦事件引入的数据读取误差。对于表示从磁记录介质读取的数据位的差分信号和响应于共模电压产生的阈值电压，确定共模电压。比较器确定差分信号中的任何一个是否超过阈值电压，从而指示发生热不平坦事件。

3. 发明授权

US07630159B2 Resistance mode comparator for determining head resistance 有权
标题翻译：用于确定磁头电阻的电阻模式比较器
公开(公告)号：US07630159B2
公开(公告)日：2009-12-08
申请号：US11140262
申请日：2005-05-27
申请人： Scott M. O'Brien , Michael P. Straub , Jeffrey A. Gleason , Shubha Bommalingaiahnapallya , Nameeta Krenz , Arvind Aemireddy
发明人： Scott M. O'Brien , Michael P. Straub , Jeffrey A. Gleason , Shubha Bommalingaiahnapallya , Nameeta Krenz , Arvind Aemireddy
IPC分类号： G11B5/03
CPC分类号： G11B5/012 , G11B5/40 , G11B5/455 , G11B2005/0016 , G11B2005/0018
摘要： An apparatus and method for determining a resistance of a magneto-resistive head. A current drawn by the head, in response to a fixed bias voltage across the head, is converted to a zero temperature coefficient current such that when supplied to a resistor connected to an input terminal of a comparator the effects of variations in the resistance value are avoided. An output signal of the comparator indicates the resistance of the magneto-resistive head.
摘要翻译：用于确定磁阻头的电阻的装置和方法。由头部引出的电流，响应于头部上的固定偏置电压而被转换为零温度系数电流，使得当提供给连接到比较器的输入端子的电阻器时，电阻值变化的影响为避免。比较器的输出信号表示磁阻头的电阻。

4. 发明授权

US07724460B2 Magneto-resistive head resistance sensor 有权
标题翻译：磁阻电阻传感器
公开(公告)号：US07724460B2
公开(公告)日：2010-05-25
申请号：US11034997
申请日：2005-01-13
申请人： David J. Fitzgerald , Jeffrey A. Gleason , James P. Howley , Scott M. O'Brien , Michael P. Straub
发明人： David J. Fitzgerald , Jeffrey A. Gleason , James P. Howley , Scott M. O'Brien , Michael P. Straub
IPC分类号： G11B5/02 , G11B5/03 , G11B5/09
CPC分类号： G11B5/02 , G11B2005/001 , G11B2005/0018
摘要： A recording system employing a magneto-resistive (MR) element senses a resistance value of the MR element and generates one or more MR resistance (MRR) signal values based on the sensed MR element resistance value. The MRR signal values might be, for example, current or voltage values proportional or inversely proportional to the MR element resistance value. The MRR signal values might be employed to control one or more of: i) a unity gain bandwidth of a bias loop for the MR element, ii) an MR read head preamplifier low corner frequency, and iii) a slew rate across the MR element.
摘要翻译：使用磁阻（MR）元件的记录系统感测MR元件的电阻值，并且基于感测的MR元件电阻值产生一个或多个MR电阻（MRR）信号值。 MRR信号值可以是例如与MR元件电阻值成比例或成反比的电流值或电压值。可以采用MRR信号值来控制以下各项中的一个或多个：i）用于MR元件的偏置环路的单位增益带宽，ii）MR读取头前置放大器低转角频率，以及iii）横跨MR元件的转换速率。

5. 发明申请

US20100090667A1 OUTPUT COMPENSATED VOLTAGE REGULATOR, AN IC INCLUDING THE SAME AND A METHOD OF PROVIDING A REGULATED VOLTAGE 有权
标题翻译：输出补偿电压调节器，包括其的IC和提供调节电压的方法
公开(公告)号：US20100090667A1
公开(公告)日：2010-04-15
申请号：US12250427
申请日：2008-10-13
申请人： Jeffrey A. Gleason , David W. Kelly , Paul Mazur
发明人： Jeffrey A. Gleason , David W. Kelly , Paul Mazur
IPC分类号： G05F1/00
CPC分类号： G05F1/56
摘要： A voltage regulator, a method of regulating voltage and an IC including a voltage regulator. In one embodiment, the voltage regulator includes: (1) a DC precision amplifier configured to generate a DC precision signal based on a reference voltage and a regulated output of the voltage regulator and (2) a response amplifier, coupled in parallel with the DC precision amplifier, configured to generate an error signal based on the reference voltage and the regulated output, the response amplifier further configured to generate the regulated output based on a regulating signal comprised of the error signal and the DC precision signal. The DC precision amplifier may be a CMOS amplifier and the response amplifier may be a NPN amplifier.
摘要翻译：电压调节器，调节电压的方法和包括电压调节器的IC。在一个实施例中，所述电压调节器包括：（1）DC精密放大器，被配置为基于所述电压调节器的参考电压和稳压输出产生DC精度信号;以及（2）响应放大器，其与所述DC 精密放大器，被配置为基于参考电压和调节输出产生误差信号，所述响应放大器还被配置为基于由所述误差信号和所述DC精度信号组成的调节信号来产生所述调节输出。 DC精密放大器可以是CMOS放大器，并且响应放大器可以是NPN放大器。

6. 发明授权

US5278700A Differentiating amplifier responsive to track locations and variations of element values from desired values 失效
标题翻译：微分放大器响应于轨迹位置和元件值与期望值的变化
公开(公告)号：US5278700A
公开(公告)日：1994-01-11
申请号：US015766
申请日：1993-01-19
申请人： David E. Sutliff , Jeffrey A. Gleason
发明人： David E. Sutliff , Jeffrey A. Gleason
IPC分类号： G11B5/012 , G11B20/10 , G11B20/12 , H03F3/45 , H03G3/30 , H03G5/16 , G11B5/09 , G11B5/02 , G11B5/035
CPC分类号： H03F3/45479 , G11B20/10009 , G11B5/012 , H03F3/45103 , H03G3/30 , H03G5/16 , G11B20/1258 , H03F2203/45302 , H03F2203/45311 , H03F2203/45388 , H03F2203/45458 , H03F2203/45466 , H03F2203/45496
摘要： An amplifier is compensated for variations in element values. A trim signal is generated based on element values of filter elements of a filter in the amplifier. An RC product in the amplifier is controlled based on the trim signal. The RC product corresponds to a product of a dynamic resistance value of a dynamic resistance element in the filter in the amplifier, and a capacitance value of capacitive elements in the filter. The RC product also determines a pole position of the amplifier. Gain in the amplifier is controlled based on the trim signal so that a desired gain is maintained.
摘要翻译：放大器补偿元件值的变化。基于放大器中的滤波器的滤波器元件的元素值产生微调信号。基于调整信号控制放大器中的RC产品。 RC乘积对应于放大器中的滤波器中的动态电阻元件的动态电阻值与滤波器中的电容元件的电容值的乘积。 RC产品还决定放大器的极点位置。基于微调信号来控制放大器中的增益，从而保持期望的增益。

7. 发明授权

US07692887B2 Method and apparatus for measuring resistance of a resistive sensor 有权
标题翻译：用于测量电阻式传感器电阻的方法和装置
公开(公告)号：US07692887B2
公开(公告)日：2010-04-06
申请号：US11520493
申请日：2006-09-13
申请人： Daniel J. Dolan, Jr. , Hao Fang , Jeffrey A. Gleason , Ross S. Wilson
发明人： Daniel J. Dolan, Jr. , Hao Fang , Jeffrey A. Gleason , Ross S. Wilson
IPC分类号： G11B27/36
CPC分类号： G11B5/455 , G11B2005/0016
摘要： An apparatus and method for determining a head parameter value (e.g., head resistance) of a resistive head. A test head current is supplied to the head during a head parameter measurement interval using the same current sources that supply a bias current to the head during an operating (read operation) interval. The determined head parameter value is latched for use in setting the control loop gain for a control loop that controls the current sources during the operating interval.
摘要翻译：一种用于确定电阻头的头部参数值（例如，头部电阻）的装置和方法。在头部参数测量间隔期间，使用在操作（读取操作）间隔期间向头部提供偏置电流的相同电流源向头部提供测试头电流。确定的头参数值被锁存用于设置在操作间隔期间控制电流源的控制回路的控制回路增益。

8. 发明申请

US20080062551A1 Method and apparatus for measuring resistance of a resistive sensor 有权
标题翻译：用于测量电阻式传感器电阻的方法和装置
公开(公告)号：US20080062551A1
公开(公告)日：2008-03-13
申请号：US11520493
申请日：2006-09-13
申请人： Daniel J. Dolan , Hao Fang , Jeffrey A. Gleason , Ross S. Wilson
发明人： Daniel J. Dolan , Hao Fang , Jeffrey A. Gleason , Ross S. Wilson
IPC分类号： G11B27/36 , G11B5/03
CPC分类号： G11B5/455 , G11B2005/0016
摘要： An apparatus and method for determining a head parameter value (e.g., head resistance) of a resistive head. A test head current is supplied to the head during a head parameter measurement interval using the same current sources that supply a bias current to the head during an operating (read operation) interval. The determined head parameter value is latched for use in setting the control loop gain for a control loop that controls the current sources during the operating interval.
摘要翻译：一种用于确定电阻头的头部参数值（例如，头部电阻）的装置和方法。在头部参数测量间隔期间，使用在操作（读取操作）间隔期间向头部提供偏置电流的相同电流源向头部提供测试头电流。确定的头参数值被锁存用于设置在操作间隔期间控制电流源的控制回路的控制回路增益。

9. 发明授权

US08773817B2 Storage device having degauss circuitry with ramp generator for use in generating chirped degauss signal 有权
标题翻译：具有用于产生啁啾消磁信号的斜坡发生器的消磁电路的存储装置
公开(公告)号：US08773817B2
公开(公告)日：2014-07-08
申请号：US13556480
申请日：2012-07-24
申请人： Paul Mazur , Robert A. Norman , Jeffrey A. Gleason , Anamul Hoque
发明人： Paul Mazur , Robert A. Norman , Jeffrey A. Gleason , Anamul Hoque
IPC分类号： G11B5/335
CPC分类号： G11B5/465
摘要： A hard disk drive or other disk-based storage device comprises a storage disk, a write head configured to write data to the disk, and control circuitry coupled to the write head. The control circuitry comprises a write driver and degauss circuitry associated with the write driver. The degauss circuitry is configured to generate a chirped degauss signal to be applied to the write head by the write driver. The degauss circuitry comprises a ramp generator configured to generate a ramp signal for controlling a frequency of at least a portion of a waveform of the chirped degauss signal. The ramp signal generated by the ramp generator may comprise a current ramp that is applied to a control input of a current controlled oscillator of the degauss circuitry.
摘要翻译：硬盘驱动器或其他基于磁盘的存储设备包括存储盘，被配置为向盘写入数据的写入头以及耦合到写入头的控制电路。控制电路包括与写入驱动器相关联的写入驱动器和消磁电路。消磁电路被配置为产生由写入驱动器施加到写入头的啁啾消磁信号。消磁电路包括斜坡发生器，其被配置为产生用于控制啁啾消磁信号的波形的至少一部分的频率的斜坡信号。由斜坡发生器产生的斜坡信号可以包括施加到消磁电路的电流控制振荡器的控制输入的电流斜坡。

10. 发明授权

US07969677B2 Write driver monitoring and detection 有权
标题翻译：编写驱动程序监控和检测
公开(公告)号：US07969677B2
公开(公告)日：2011-06-28
申请号：US12408847
申请日：2009-03-23
申请人： Jeffrey A. Gleason , Anamul Hoque , David W. Kelly
发明人： Jeffrey A. Gleason , Anamul Hoque , David W. Kelly
IPC分类号： G11B27/36 , G11B5/02
CPC分类号： G11B27/36 , G11B2220/2516
摘要： Electronic circuitry and methods are disclosed for monitoring a portion of a write driver, for example, a steady state value of a write driver of a hard disk drive preamplifier. Based on a result of the monitoring, a condition, such as a fault, can be detected in the write driver. For example, apparatus for monitoring a write driver of a disk drive system comprises a comparator circuit coupled to an output of the write driver and configured to compare a value present at the output of the write driver with a reference value such that at least one condition associated with the write driver is detectable as a result of the comparison of the write driver output value and the reference value.
摘要翻译：公开了用于监视写入驱动器的一部分的电子电路和方法，例如硬盘驱动器前置放大器的写入驱动器的稳定状态值。基于监视的结果，可以在写入驱动器中检测到诸如故障的状况。例如，用于监视磁盘驱动器系统的写入驱动器的装置包括一个比较器电路，其耦合到该写入驱动器的一个输出并被配置为将存在于写入驱动器的输出端上的值与一个参考值进行比较，使得至少一个条件作为写入驱动器输出值和参考值的比较的结果，与写入驱动器相关联的可检测。

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