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1.发明授权Variable gain amplifier with temperature compensation for use in a disk drive system 有权具有温度补偿的可变增益放大器，用于磁盘驱动器系统公开(公告)号：US06282038B1
公开(公告)日：2001-08-28
申请号：US09253122
申请日：1999-02-19
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。
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2.发明授权Method for measuring relative and absolute amplitudes of a signal read from a data storage medium 有权用于测量从数据存储介质读取的信号的相对和绝对幅度的方法公开(公告)号：US06268972B1
公开(公告)日：2001-07-31
申请号：US09157226
申请日：1998-09-18
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。
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公开(公告)号：US20110296215A1
公开(公告)日：2011-12-01
申请号：US12790283
申请日：2010-05-28
CPC分类号： G06F1/3203 , G06F1/3253 , Y02D10/151 , Y02D50/20
摘要： A signal generator circuit for reducing power consumption of message communications between a first device including the signal generator circuit and a second device coupled to the first device comprises a switching circuit and a controller coupled to the switching circuit. The controller is operative to receive a reference clock signal, to receive at least a first control signal indicative of a request for the first device to send a message to the second device when the first device is in a first mode of operation, and to generate an output control signal and an output data signal. The output control signal is operative as a function of the first control signal to selectively power up the switching circuit and a transmitter driver during the first mode. The output data signal includes the message supplied to the transmitter driver, via the switching circuit, for transmission to the second device during the first mode.
摘要翻译： 一种用于降低包括信号发生器电路的第一装置与耦合到第一装置的第二装置之间的消息通信的功耗的信号发生器电路包括开关电路和耦合到开关电路的控制器。 控制器可操作以接收参考时钟信号，以在第一设备处于第一操作模式时接收指示第一设备向第二设备发送消息的请求的至少第一控制信号，并产生 输出控制信号和输出数据信号。 输出控制信号作为第一控制信号的功能运行，以在第一模式期间选择性地给开关电路和发射机驱动器供电。 输出数据信号包括经由开关电路提供给发射机驱动器的消息，用于在第一模式期间传输到第二设备。
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公开(公告)号：US5821810A
公开(公告)日：1998-10-13
申请号：US791939
申请日：1997-01-31
CPC分类号： H03G7/00 , G11B20/10009 , G11B5/012 , G11B5/09
摘要： An improved method and apparatus are provided for dc offset trim adjustment of a variable gain amplifier. The VGA has predetermined overall gain endpoints. A minimum gain and a maximum gain are identified for the VGA in a preferred operational range. The identified minimum gain and the identified maximum gain for the VGA in the preferred operational range are spaced apart inwardly from the VGA predetermined overall gain endpoints. The minimum gain for the VGA in operation is set, then trim adjustment of the VGA is provided to minimize an output of the VGA. Then the maximum gain for the VGA in operation is set, then dc offset trim adjustment of the VGA is provided to minimize an output of the VGA.
摘要翻译： 为可变增益放大器的直流偏移调整调整提供了一种改进的方法和装置。 VGA具有预定的总增益端点。 在优选的操作范围内为VGA识别最小增益和最大增益。 识别的最小增益和在优选操作范围内的所识别的VGA的最大增益与VGA预定的总增益端点向内间隔开。 设置VGA的最小增益，然后调整VGA的调整，以最小化VGA的输出。 然后设置VGA的最大增益，然后提供VGA的直流偏移调整调整以最小化VGA的输出。
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5.发明授权Automatic gain control (AGC) loop for characterizing continuous-time or discrete-time circuitry gain response across frequency 有权自动增益控制（AGC）循环，用于表征跨频率的连续时间或离散时间电路增益响应公开(公告)号：US06891361B2
公开(公告)日：2005-05-10
申请号：US10335555
申请日：2002-12-31
申请人： Gregory Scott Winn
发明人： Gregory Scott Winn
CPC分类号： G11B20/10027 , G01R31/2837 , G01R31/2884 , G11B20/10009 , H03G3/30
摘要： The present invention is a method, system, and product for testing operating characteristics of a continuous-time or discrete-time device under test, which is included within a circuit. The operating characteristics of the continuous-time or discrete-time device are tested utilizing electronic components that already exist within the circuit such that a test circuit is not utilized to test the device. The circuit includes a variable gain amplifier and an automatic gain correction (AGC) circuit. The operating characteristics of the device are tested utilizing the variable gain amplifier and said AGC circuit.
摘要翻译： 本发明是用于测试包括在电路内的连续时间或离散时间设备的操作特性的方法，系统和产品。 使用已经存在于电路内的电子部件来测试连续时间或离散时间装置的操作特性，使得测试电路不被用于测试装置。 该电路包括可变增益放大器和自动增益校正（AGC）电路。 利用可变增益放大器和AGC电路对器件的工作特性进行测试。
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公开(公告)号：US08713338B2
公开(公告)日：2014-04-29
申请号：US12790283
申请日：2010-05-28
IPC分类号： G06F1/00
CPC分类号： G06F1/3203 , G06F1/3253 , Y02D10/151 , Y02D50/20
摘要： A signal generator circuit for reducing power consumption of out-of-band message communications between a first device including the signal generator circuit and a second device coupled to the first device comprises a switching circuit and a controller coupled to the switching circuit. The controller is operative to receive a reference clock signal and at least a first control signal indicative of a request for the first device to send a message to the second device when the first device is in a first mode of operation. The controller generates an output control signal and an output data signal. The output control signal is operative as a function of the first control signal to selectively power up the switching circuit and a transmitter driver during the first mode. The output data signal includes the message supplied to the transmitter driver for transmission to the second device during the first mode.
摘要翻译： 一种用于降低包括信号发生器电路的第一设备和耦合到第一设备的第二设备之间的带外消息通信的功耗的信号发生器电路包括切换电路和耦合到开关电路的控制器。 所述控制器用于当所述第一设备处于第一操作模式时，接收参考时钟信号和至少第一控制信号，所述至少第一控制信号指示所述第一设备向所述第二设备发送消息的请求。 控制器产生输出控制信号和输出数据信号。 输出控制信号作为第一控制信号的功能运行，以在第一模式期间选择性地给开关电路和发射机驱动器供电。 输出数据信号包括在第一模式期间提供给发射机驱动器以传送到第二设备的消息。
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7.发明授权
公开(公告)号：US5910751A
公开(公告)日：1999-06-08
申请号：US800608
申请日：1997-02-14
CPC分类号： H03F1/3211 , H03F1/302 , H03G1/04
摘要： A circuit arrangement and method vary in response to temperature changes the signal swing of an input signal to an analog circuit which has a temperature-dependent effective linear signal range. A variable gain circuit varies the signal swing of the input signal in response to a control signal supplied thereto by a temperature control circuit so that the signal swing tracks changes in the effective linear signal range of the analog circuit. In this manner, signal to noise ratio may be optimized and distortion may be minimized over a range of operating temperatures for the analog circuit.
摘要翻译： 电路布置和方法响应于温度改变输入信号的信号摆动到具有温度依赖的有效线性信号范围的模拟电路而变化。 可变增益电路响应于由温度控制电路提供给其的控制信号而改变输入信号的信号摆幅，使得信号摆动轨道在模拟电路的有效线性信号范围内变化。 以这种方式，可以优化信噪比，并且在模拟电路的工作温度范围内可以使失真最小化。
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