公开(公告)号：US08605381B2

公开(公告)日：2013-12-10

申请号：US12875734

申请日：2010-09-03

申请人： George Mathew ,  Pradeep Padukone ,  Hongwei Song ,  Suharli Tedja

发明人： George Mathew ,  Pradeep Padukone ,  Hongwei Song ,  Suharli Tedja

IPC分类号： G11B21/02 ,  G11B27/36

CPC分类号： G11B5/6029

摘要： Various embodiments of the present invention provide systems and methods for phase compensated harmonic sensing. For example, a circuit for harmonics calculation is disclosed that includes a phase difference estimation circuit and a phase offset compensation circuit. The harmonic calculation circuit is operable to calculate a first harmonic based on a periodic data pattern and a second harmonic based on the periodic data pattern. The phase difference estimation circuit operable to calculate a phase difference between the first harmonic and the second harmonic. The phase offset compensation circuit operable to align the second harmonic with the first harmonic to yield an aligned harmonic.

摘要翻译： 本发明的各种实施例提供了用于相位补偿谐波感测的系统和方法。 例如，公开了一种用于谐波计算的电路，其包括相位差估计电路和相位偏移补偿电路。 谐波计算电路可操作以基于周期性数据模式和基于周期性数据模式的二次谐波计算第一谐波。 所述相位差估计电路可操作以计算所述一次谐波和所述第二谐波之间的相位差。 相位偏移补偿电路可操作以将二次谐波与第一谐波对准以产生对准的谐波。

公开(公告)号：US20120056612A1

公开(公告)日：2012-03-08

申请号：US12875734

申请日：2010-09-03

申请人： George Mathew ,  Pradeep Padukone ,  Hongwei Song ,  Suharli Tedja

发明人： George Mathew ,  Pradeep Padukone ,  Hongwei Song ,  Suharli Tedja

IPC分类号： G01R25/00

CPC分类号： G11B5/6029

摘要： Various embodiments of the present invention provide systems and methods for phase compensated harmonic sensing. For example, a circuit for harmonics calculation is disclosed that includes a phase difference estimation circuit and a phase offset compensation circuit. The harmonic calculation circuit is operable to calculate a first harmonic based on a periodic data pattern and a second harmonic based on the periodic data pattern. The phase difference estimation circuit operable to calculate a phase difference between the first harmonic and the second harmonic. The phase offset compensation circuit operable to align the second harmonic with the first harmonic to yield an aligned harmonic.

摘要翻译： 本发明的各种实施例提供了用于相位补偿谐波感测的系统和方法。 例如，公开了一种用于谐波计算的电路，其包括相位差估计电路和相位偏移补偿电路。 谐波计算电路可操作以基于周期性数据模式和基于周期性数据模式的二次谐波计算第一谐波。 所述相位差估计电路可操作以计算所述一次谐波和所述第二谐波之间的相位差。 相位偏移补偿电路可操作以将二次谐波与第一谐波对准以产生对准的谐波。

公开(公告)号：US07271753B1

公开(公告)日：2007-09-18

申请号：US11436824

申请日：2006-05-18

申请人： Pradeep Padukone ,  Bin Liu

发明人： Pradeep Padukone ,  Bin Liu

IPC分类号： H03M1/62

CPC分类号： G11B5/58 ,  G11B5/6005 ,  G11B5/6029 ,  H03M1/1014 ,  H03M1/12

摘要： Methods of calibrating an analog front end (AFE) of a read/write channel include measuring a first magnitude of a test signal, measuring a second magnitude of an output signal of the AFE generated in response to the test signal, and comparing the first magnitude and the second magnitude to generate a measure of a gain of the AFE at a frequency of the test signal. A data storage device includes a read/write head configured to generate an analog input signal, an AFE coupled to the read/write head and configured to amplify and filter the analog input signal, a test signal generator configured to generate a test signal having a frequency substantially equal to a fundamental frequency of the analog input signal or any of its harmonics, and an attenuator coupled between the test signal generator and the AFE.

摘要翻译： 校准读/写通道的模拟前端（AFE）的方法包括测量测试信号的第一幅度，测量响应于测试信号产生的AFE的输出信号的第二幅度，并且比较第一幅度 以及第二幅度以产生在测试信号的频率处的AFE的增益的量度。 数据存储装置包括被配置为产生模拟输入信号的读/写头，耦合到读/写头并被配置为放大和滤波模拟输入信号的AFE，被配置为产生测试信号的测试信号发生器， 频率基本上等于模拟输入信号或其任何谐波的基频，以及耦合在测试信号发生器和AFE之间的衰减器。