公开(公告)号：US06268972B1

公开(公告)日：2001-07-31

申请号：US09157226

申请日：1998-09-18

申请人： Rick Allen Philpott ,  Gregory Scott Winn

发明人： Rick Allen Philpott ,  Gregory Scott Winn

IPC分类号： G11B509

CPC分类号： B82Y25/00 ,  B82Y10/00 ,  G11B5/455 ,  G11B19/04 ,  G11B20/10009 ,  G11B27/36 ,  G11B2005/0016 ,  G11B2005/3996 ,  Y10S977/725 ,  Y10S977/943 ,  Y10S977/96

摘要： A method for measuring an amplitude of a readback signal obtained from a data storage medium involves transmitting the readback signal to a gain modifying amplifier, such as a variable gain amplifier (VGA), preferably provided in the read channel. A voltage signal associated with a loop gain of the amplification circuitry is sensed and compared with a number of control voltage signals, each of the control voltage signals being associated with a corresponding digital word value. The digital word value associated with a control voltage signal that is equal to the sensed voltage signal represents the relative amplitude of the readback signal. Gain characterization circuitry may further be combined with readback signal amplitude measuring circuitry, preferably in-situ a read channel, to obtain the absolute amplitude of a readback signal. Gain characteristics of the amplification circuitry are determined by applying reference voltage signals associated with corresponding pre-established gain values to the signal input of the gain modifying amplifier. A control voltage signal is selectively applied to the amplifier for each of the reference voltage signals until the amplifier output voltage signal is substantially equal to a pre-established reference voltage signal. Amplitude measurements may thereafter be taken to obtain the absolute amplitude of readback signals. Readback signal amplitude measurements may be performed when the read channel is in a read mode, idle mode, or servo mode of operation.

摘要翻译： 用于测量从数据存储介质获得的回读信号的幅度的方法包括将回读信号发送到增益修改放大器，诸如可变增益放大器（VGA），优选地设置在读通道中。 检测与放大电路的环路增益相关联的电压信号，并将其与多个控制电压信号进行比较，每个控制电压信号与相应的数字字值相关联。 与等于感测电压信号的控制电压信号相关联的数字字值表示回读信号的相对幅度。 增益表征电路还可以与回读信号幅度测量电路组合，优选地是原位读取通道，以获得回读信号的绝对幅度。 放大电路的增益特性通过将与相应的预先建立的增益值相关联的参考电压信号施加到增益修改放大器的信号输入来确定。 对于每个参考电压信号，控制电压信号被选择性地施加到放大器，直到放大器输出电压信号基本上等于预先建立的参考电压信号。 之后可以进行幅度测量以获得回读信号的绝对幅度。 当读取通道处于读取模式，空闲模式或伺服操作模式时，可以执行回读信号幅度测量。

公开(公告)号：US07643536B2

公开(公告)日：2010-01-05

申请号：US10915576

申请日：2004-08-10

申请人： Timothy Michael Schaefer ,  Jonathan Darrel Coker ,  Rick Allen Philpott ,  Edward Brian Welch ,  David R. Holmes, III

发明人： Timothy Michael Schaefer ,  Jonathan Darrel Coker ,  Rick Allen Philpott ,  Edward Brian Welch ,  David R. Holmes, III

IPC分类号： H04B1/00

CPC分类号： H04B1/707 ,  H04J13/16

摘要： A system provides for remote monitoring using asynchronous code division multiple access (CDMA) communication techniques between a base station and one or more transponders. Each transponder is attached or otherwise associated with an object or an environment to be monitored. Upon receipt of an interrogation signal, a transponder generates and transmits a coded transponder signal containing the monitored data. The coded transponder signal is generated using a spreading code. Each transponder is associated with a unique, mutually exclusive set of spreading codes. Each spreading code is based on a unique transponder address and the monitored data to be sent. A detector asynchronously monitors received signals for any of the available spreading codes. Once the detector detects a particular spreading code, the base station can identify the source transponder and extract the monitored data.

摘要翻译： 一种系统提供了在基站和一个或多个转发器之间使用异步码分多址（CDMA）通信技术的远程监控。 每个应答器被连接或以其他方式与要监视的对象或环境相关联。 在接收到询问信号时，应答器产生并发送包含监视数据的编码的应答器信号。 使用扩展码产生编码的应答器信号。 每个转发器与唯一的，相互排斥的扩展码组相关联。 每个扩展码基于唯一的应答器地址和要发送的监视数据。 检测器异步监视任何可用扩展码的接收信号。 一旦检测器检测到特定的扩展码，基站可以识别源应答器并提取监视的数据。

公开(公告)号：US07830948B2

公开(公告)日：2010-11-09

申请号：US12622539

申请日：2009-11-20

申请人： Timothy Michael Schaefer ,  Jonathan Darrel Coker ,  Rick Allen Philpott ,  Edward Brian Welch ,  David R. Holmes, III

发明人： Timothy Michael Schaefer ,  Jonathan Darrel Coker ,  Rick Allen Philpott ,  Edward Brian Welch ,  David R. Holmes, III

IPC分类号： H04L27/30

CPC分类号： H04B1/707 ,  H04J13/16

摘要： A system provides for remote monitoring using asynchronous code division multiple access (CDMA) communication techniques between a base station and one or more transponders. Each transponder is attached or otherwise associated with an object or an environment to be monitored. Upon receipt of an interrogation signal, a transponder generates and transmits a coded transponder signal containing the monitored data. The coded transponder signal is generated using a spreading code. Each transponder is associated with a unique, mutually exclusive set of spreading codes. Each spreading code is based on a unique transponder address and the monitored data to be sent. A detector asynchronously monitors received signals for any of the available spreading codes. Once the detector detects a particular spreading code, the base station can identify the source transponder and extract the monitored data.

摘要翻译： 一种系统提供了在基站和一个或多个转发器之间使用异步码分多址（CDMA）通信技术的远程监控。 每个应答器被连接或以其他方式与要监视的对象或环境相关联。 在接收到询问信号时，应答器产生并发送包含监视数据的编码的应答器信号。 使用扩展码产生编码的应答器信号。 每个转发器与唯一的，相互排斥的扩展码组相关联。 每个扩展码基于唯一的应答器地址和要发送的监视数据。 检测器异步监视任何可用扩展码的接收信号。 一旦检测器检测到特定的扩展码，基站可以识别源应答器并提取监视的数据。

公开(公告)号：US06469856B1

公开(公告)日：2002-10-22

申请号：US09570277

申请日：2000-05-12

申请人： Chad Edward Mitchell ,  Rick Allen Philpott ,  Jaydip Bhaumik ,  Raymond Alan Richetta

发明人： Chad Edward Mitchell ,  Rick Allen Philpott ,  Jaydip Bhaumik ,  Raymond Alan Richetta

IPC分类号： G11B509

CPC分类号： G11B20/10046 ,  G11B5/09 ,  G11B20/10009 ,  G11B2005/0013

摘要： A system and method provides for calibrating a corner frequency of a tunable filter coupled to a read channel of a data storage system to a desired frequency. A signal having a frequency equal to the target corner frequency is generated. A gain of the signal is adjusted to a gain threshold. The gain of the signal is then increased from the gain threshold by a pre-established amount, such as by 3 dB. The corner frequency of the signal is shifted until the gain of the signal is substantially equal to the gain threshold, at which point the corner frequency of the tunable filter is calibrated to the desired frequency. The signal generated is a peak-detectable signal. The corner frequency of a tunable filter may be a low or high corner frequency appropriate for filtering a data signal or a servo signal. The corner frequency calibration circuitry may be implemented in-situ the read channel circuitry of a data storage system.

摘要翻译： 系统和方法提供了将耦合到数据存储系统的读通道的可调谐滤波器的转角频率校准到期望的频率。 产生频率等于目标转角频率的信号。 信号的增益被调整到增益阈值。 然后，信号的增益从增益阈值增加预设量，例如3dB。 信号的转角频率移动直到信号的增益基本上等于增益阈值，此时可调谐滤波器的转角频率被校准到期望的频率。 产生的信号是峰值可检测信号。 可调谐滤波器的转角频率可以是适合于对数据信号或伺服信号进行滤波的低或高转角频率。 角频率校准电路可以原位实现数据存储系统的读通道电路。

公开(公告)号：US06429988B1

公开(公告)日：2002-08-06

申请号：US09667905

申请日：2000-09-22

申请人： Jaydip Bhaumik ,  Chad Edward Mitchell ,  Rick Allen Philpott ,  Raymond Alan Richetta

发明人： Jaydip Bhaumik ,  Chad Edward Mitchell ,  Rick Allen Philpott ,  Raymond Alan Richetta

IPC分类号： G11B509

CPC分类号： G11B20/1403 ,  G11B5/59622 ,  H03J3/00 ,  H03J2200/07

摘要： A system and method are provided for calibrating a corner frequency of a tunable filter using an ADC code difference method. A method for calibrating a corner frequency of a tunable filter in a direct access storage device includes generating a signal having a frequency within a pass band of the tunable filter to be passed to the tunable filter. The gain of the signal is adjusted to a first threshold level. The corner frequency of the signal is shifted to a second threshold level, whereby the corner frequency of the tunable filter is calibrated at a desired frequency. A system for calibrating a corner frequency of a tunable filter in a direct access storage device includes calibrate control logic coupled to a tunable filter. A signal source generating a signal having a frequency within a pass band of the tunable filter to be passed to the tunable filter is coupled to the tunable filter by a variable gain amplifier. An analog-to-digital converter (ADC) is coupled to the tunable filter. The ADC produces a digitized signal in response to receiving the signal from the filter. The calibrate control logic adjusts a gain of the digitized signal to a first threshold level. The calibrate control logic shifts the corner frequency of the digitized signal to a second threshold level, whereby the corner frequency of the tunable filter is calibrated at a desired frequency. The first threshold level is set to a first ADC code and the second threshold level is set to a second ADC code. The second threshold level, second ADC code is set to the equivalent code of any given attenuation setting, for example, about 3 dB less than the first threshold level, first ADC code.

摘要翻译： 提供了一种使用ADC代码差分法来校准可调谐滤波器的转角频率的系统和方法。 用于校准直接存取存储设备中的可调谐滤波器的转角频率的方法包括产生具有可调谐滤波器的通带内的频率的信号以传递到可调谐滤波器。 信号的增益被调整到第一阈值水平。 信号的转角频率被转移到第二阈值电平，由此可调谐滤波器的转角频率以期望的频率被校准。 用于校准直接存取存储设备中可调谐滤波器的转角频率的系统包括耦合到可调谐滤波器的校准控制逻辑。 产生具有要传递到可调滤波器的可调谐滤波器的通带内的频率的信号的信号源通过可变增益放大器耦合到可调谐滤波器。 模数转换器（ADC）耦合到可调谐滤波器。 响应于接收到来自滤波器的信号，ADC产生数字化信号。 校准控制逻辑将数字化信号的增益调整到第一阈值电平。 校准控制逻辑将数字化信号的转角频率移动到第二阈值电平，由此以期望的频率校准可调滤波器的转角频率。 第一阈值电平被设置为第一ADC代码，第二阈值电平被设置为第二ADC代码。 第二阈值电平，第二ADC代码被设置为任何给定衰减设置的等效代码，例如，比第一阈值电平小约3dB的第一ADC代码。

公开(公告)号：US20100066506A1

公开(公告)日：2010-03-18

申请号：US12622539

申请日：2009-11-20

申请人： Timothy Michael Schaefer ,  Jonathan Darrel Coker ,  Rick Allen Philpott ,  Edward Brian Welch ,  David R. Holmes, III

发明人： Timothy Michael Schaefer ,  Jonathan Darrel Coker ,  Rick Allen Philpott ,  Edward Brian Welch ,  David R. Holmes, III

IPC分类号： H04Q5/22 ,  H04B1/707

CPC分类号： H04B1/707 ,  H04J13/16

摘要： A system provides for remote monitoring using asynchronous code division multiple access (CDMA) communication techniques between a base station and one or more transponders. Each transponder is attached or otherwise associated with an object or an environment to be monitored. Upon receipt of an interrogation signal, a transponder generates and transmits a coded transponder signal containing the monitored data. The coded transponder signal is generated using a spreading code. Each transponder is associated with a unique, mutually exclusive set of spreading codes. Each spreading code is based on a unique transponder address and the monitored data to be sent. A detector asynchronously monitors received signals for any of the available spreading codes. Once the detector detects a particular spreading code, the base station can identify the source transponder and extract the monitored data.

摘要翻译： 一种系统提供了在基站和一个或多个转发器之间使用异步码分多址（CDMA）通信技术的远程监控。 每个应答器被连接或以其他方式与要监视的对象或环境相关联。 在接收到询问信号时，应答器产生并发送包含监视数据的编码的应答器信号。 使用扩展码产生编码的应答器信号。 每个转发器与唯一的，相互排斥的扩展码组相关联。 每个扩展码基于唯一的应答器地址和要发送的监视数据。 检测器异步监视任何可用扩展码的接收信号。 一旦检测器检测到特定的扩展码，基站可以识别源应答器并提取监视的数据。

公开(公告)号：US06441983B1

公开(公告)日：2002-08-27

申请号：US09165750

申请日：1998-10-02

申请人： Rick Allen Philpott ,  Chad Edward Mitchell

发明人： Rick Allen Philpott ,  Chad Edward Mitchell

IPC分类号： G11B502

CPC分类号： G11B20/10027 ,  G11B5/012 ,  G11B5/09 ,  G11B20/10009 ,  G11B20/10046 ,  G11B2005/0013

摘要： An apparatus and method for calibrating a cutoff frequency of a tunable filter, such as a tunable filter coupled to a read channel of a data storage system is disclosed. A calibration circuit includes a variable gain amplifier (VGA), an envelope detector, and a tunable filter coupled therebetween. A calibration signal having a preestablished frequency representing a specified cutoff frequency associated with the tunable filter is applied to the VGA. The gain of the amplifier is adjusted until an amplitude of an output signal provided by the filter is substantially equal to a first predetermined amplitude. A cutoff frequency of the filter is then adjusted until an amplitude of an output signal provided by the filter is substantially equal to a second predetermined amplitude, at which time the desired cutoff frequency of the tunable filter is precisely established. A single cutoff frequency or the low and high cutoff freqencies of a range of cutoff frequencies may be calibrated. The envelope detector includes a number of analog comparators which are used to compare an output signal provided by the filter with predetermined voltage amplitudes provided by first and second reference voltage sources. A control circuit controls amplifier gain and adjusts the cutoff frequency of the filter. A cutoff frequency calibration circuit according to the present invention may be advantageously implemented in-situ a read channel of a disk drive system.

摘要翻译： 公开了一种用于校准可调滤波器的截止频率的装置和方法，例如耦合到数据存储系统的读通道的可调谐滤波器。 校准电路包括可变增益放大器（VGA），包络检测器和耦合在其间的可调谐滤波器。 具有表示与可调谐滤波器相关联的指定截止频率的预先建立的频率的校准信号被施加到VGA。 调整放大器的增益，直到由滤波器提供的输出信号的幅度基本上等于第一预定幅度。 然后调整滤波器的截止频率，直到由滤波器提供的输出信号的振幅基本上等于第二预定幅度，此时可精确建立可调滤波器的期望截止频率。 可以校准一个截止频率或截止频率范围的低和高截止频率。 包络检测器包括多个模拟比较器，用于将由滤波器提供的输出信号与由第一和第二参考电压源提供的预定电压幅度进行比较。 控制电路控制放大器增益并调节滤波器的截止频率。 根据本发明的截止频率校准电路可以有利地实现磁盘驱动器系统的读取通道。

公开(公告)号：US06282038B1

公开(公告)日：2001-08-28

申请号：US09253122

申请日：1999-02-19

申请人： Anthony Richard Bonaccio ,  Rick Allen Philpott ,  Peter John Windler ,  Gregory Scott Winn

发明人： Anthony Richard Bonaccio ,  Rick Allen Philpott ,  Peter John Windler ,  Gregory Scott Winn

IPC分类号： G11B509

CPC分类号： B82Y25/00 ,  B82Y10/00 ,  G11B5/012 ,  G11B5/455 ,  G11B19/04 ,  G11B20/10009 ,  G11B27/36 ,  G11B33/14 ,  G11B2005/0016 ,  G11B2005/3996 ,  H03G1/04

摘要： An apparatus and method for estimating an amplitude of a readback signal obtained from a data storage medium and input to a gain modifying amplifier involves sensing an amplifier output signal in response to a readback signal applied to the amplifier. An amplifier control signal is produced which is representative of a difference between the amplifier output signal and a reference signal. A compensation signal associated with a temperature coefficient of amplifier gain is generated, and an estimate signal indicative of the amplitude of the readback signal is produced using the compensation signal. The estimate signal is representative of readback signal amplitude when the estimate signal has a magnitude equivalent to that of the difference signal and a polarity opposite that of the difference signal. Generating the compensation signal may further involve generating a first compensation signal having a magnitude proportional to absolute temperature and generating a second compensation signal having a magnitude independent of temperature. The first and second compensation signals may be selectively used to cancel temperature related gain and polarity variations in the amplifier control signal. A circuit for estimating an amplitude of a readback signal includes a variable gain amplifier, a temperature compensation circuit, and a comparator, all of which have an equivalent temperature profile and are provided on a common IC substrate. The circuit, which further includes an N-bit DAC and a logic circuit, may be implemented in a disk drive system.

摘要翻译： 用于估计从数据存储介质获得并输入到增益修改放大器的回读信号的幅度的装置和方法包括响应于施加到放大器的回读信号来感测放大器输出信号。 产生放大器控制信号，其表示放大器输出信号和参考信号之间的差。 产生与放大器增益的温度系数相关联的补偿信号，并且使用补偿信号产生表示回读信号的幅度的估计信号。 当估计信号的幅度等于差分信号的幅度和与差分信号的极性相反的极性时，估计信号代表回读信号幅度。 生成补偿信号还可以包括产生具有与绝对温度成比例的幅度的第一补偿信号，并产生具有与温度无关的幅度的第二补偿信号。 可以选择性地使用第一和第二补偿信号来消除放大器控制信号中与温度有关的增益和极性变化。 用于估计回读信号的幅度的电路包括可变增益放大器，温度补偿电路和比较器，所有这些都具有等效的温度分布并且设置在公共IC基板上。 进一步包括N位DAC和逻辑电路的电路可以在磁盘驱动器系统中实现。

公开(公告)号：US06226562B1

公开(公告)日：2001-05-01

申请号：US09150559

申请日：1998-09-10

申请人： Rick Allen Philpott

发明人： Rick Allen Philpott

IPC分类号： G06F1900

CPC分类号： G11C29/028 ,  G12B13/00

摘要： A method and system for calibrating analog integrated circuits. Initially, a single calibration circuit is formed integral with a group of analog integrated circuits. A control signal and a calibration signal are generated from the calibration circuit. Next, the control signal and the calibration signal are selectively coupled to an input of a particular analog integrated circuit among the group of analog integrated circuits. The particular analog integrated circuit is then selected for calibration via the control signal. An output of the particular analog integrated circuit is thereafter observed, in response to enabling the particular analog integrated circuit for calibration via the control signal, such that if an output of the particular analog integrated circuit corresponds to the calibration signal, a successful calibration of the particular analog integrated circuit is indicated, thereby permitting the single calibration circuit to generically calibrate a multitude of diverse analog integrated circuits. The output of the particular analog integrated circuit is coupled to an input of the single calibration circuit, and the calibration value is incremented until the particular analog integrated circuit is calibrated, such that upon completion of the calibration, the calibration value comprises a current calibration value associated with the particular analog integrated circuit. In addition, if the output of the particular analog integrated circuit is composed of a logically high value, then an indication is provided that the particular analog integrated circuit has been successfully calibrated.

摘要翻译： 一种用于校准模拟集成电路的方法和系统。 最初，单个校准电路与一组模拟集成电路集成。 从校准电路产生控制信号和校准信号。 接下来，控制信号和校准信号选择性地耦合到模拟集成电路组中的特定模拟集成电路的输入。 然后通过控制信号选择特定的模拟集成电路进行校准。 响应于特定模拟集成电路经由控制信号进行校准，此后观察特定模拟集成电路的输出，使得如果特定模拟集成电路的输出对应于校准信号，则成功校准 指示特定的模拟集成电路，从而允许单个校准电路通常校准多个不同的模拟集成电路。 特定模拟集成电路的输出耦合到单个校准电路的输入，并且校准值递增直到特定模拟集成电路被校准，使得在校准完成时，校准值包括当前校准值 与特定模拟集成电路相关联。 此外，如果特定模拟集成电路的输出由逻辑高值组成，则提供特定模拟集成电路已被成功校准的指示。

公开(公告)号：US6031672A

公开(公告)日：2000-02-29

申请号：US767970

申请日：1996-12-17

申请人： Mark Andrew Bergquist ,  Jonathan Darrel Coker ,  Richard Leo Galbraith ,  Rick Allen Philpott ,  David James Stanek

发明人： Mark Andrew Bergquist ,  Jonathan Darrel Coker ,  Richard Leo Galbraith ,  Rick Allen Philpott ,  David James Stanek

IPC分类号： G11B5/596 ,  G11B21/10 ,  G11B5/09

CPC分类号： G11B21/10 ,  G11B5/59605 ,  G11B5/59633

摘要： Methods and apparatus are provided for detecting servo information in a direct access storage device. A plurality of data symbols are read from a disk to produce a readback signal. Each data symbol and each sequence of data symbols contains servo identification information. A correlation filter provides a matched filter function of an expected readback signal of the plurality of data symbols to produce a correlated readback signal. A threshold detector is coupled to the correlation filter for identifying a threshold signal representative of the data symbol. A data separator responsive to the threshold detector windows the threshold signal and provides clock and data signals. The data separator includes a digital variable frequency oscillator (VFO) which optimally centers incoming servo information from the disk in a timing window and provides standard clocked data for a servo processor. The threshold detector has a variable threshold voltage that is programmed using a trim digital-to-analog converter (DAC).

摘要翻译： 提供了用于在直接存取存储装置中检测伺服信息的方法和装置。 从盘读取多个数据符号以产生回读信号。 每个数据符号和每个数据符号序列都包含伺服识别信息。 相关滤波器提供多个数据符号的预期回读信号的匹配滤波器函数以产生相关回读信号。 阈值检测器耦合到相关滤波器，用于识别表示数据符号的阈值信号。 响应于阈值检测器的数据分离器将阈值信号扫描并提供时钟和数据信号。 数据分离器包括数字可变频率振荡器（VFO），其在定时窗口中最佳地对来自盘的输入伺服信息进行中心，并为伺服处理器提供标准时钟数据。 阈值检测器具有使用微调数模转换器（DAC）编程的可变阈值电压。