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公开(公告)号：US5281931A
公开(公告)日：1994-01-25
申请号：US957853
申请日：1992-10-08
申请人： James A. Bailey , Paul H. Francois
发明人： James A. Bailey , Paul H. Francois
CPC分类号： H03H11/04
摘要： An on-chip apparatus and method are provided for automatically tuning a continuous time filter in which a single filter selectively filters an information signal or, when tuning is desired, an unfiltered reference signal. During tuning, a controller determines the amplitudes of the unfiltered and filtered reference signals and their ratio. From the ratio, the controller ascertains a corresponding center or tuned frequency of the filter. If the ascertained frequency does not substantially equal a desired tuned frequency, the controller directs a bias controller to adjust the bias of the filter until the tuned frequency is substantially equal to the desired tuned frequency.
摘要翻译： 提供一种片上装置和方法，用于自动调谐连续时间滤波器，其中单个滤波器选择性地滤波信息信号，或者当需要调谐时，未滤波的参考信号。 在调谐期间，控制器确定未滤波和滤波的参考信号及其比值的幅度。 根据比例，控制器确定滤波器的相应中心或调谐频率。 如果所确定的频率基本上不等于期望的调谐频率，则控制器引导偏置控制器来调整滤波器的偏置，直到调谐频率基本上等于期望的调谐频率。
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公开(公告)号：US5442618A
公开(公告)日：1995-08-15
申请号：US150896
申请日：1993-11-12
IPC分类号： G11B7/005 , G11B11/105 , G11B20/18 , G11B27/36 , G11B7/00
CPC分类号： G11B11/10595 , G11B20/1816 , G11B27/36 , G11B7/005 , G11B11/10515
摘要： An optical drive provides an internal routine for automatically optimizing the common mode rejection ratio of the magneto-optic data output signal. A microprocessor provides control to a controller module which in turn supplies a plurality of calibration signals to a data detecting portion. The calibration signals modify predetermined parameters of the data detecting portion based upon measuring a predetermined parameter indicative of the common mode rejection ratio. The common mode rejection ratio optimization corrects for mismatches in both the optical elements and in the electronic data circuits.
摘要翻译： 光驱提供用于自动优化磁光数据输出信号的共模抑制比的内部程序。 微处理器向控制器模块提供控制，控制器模块又向数据检测部分提供多个校准信号。 基于测量表示共模抑制比的预定参数，校准信号修改数据检测部分的预定参数。 共模抑制比优化校正了光学元件和电子数据电路中的不匹配。
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公开(公告)号：US5309295A
公开(公告)日：1994-05-03
申请号：US957858
申请日：1992-10-08
申请人： James A. Bailey , Paul H. Francois
发明人： James A. Bailey , Paul H. Francois
CPC分类号： G11B5/02 , G01R33/09 , G11B5/035 , G11B2005/0018
摘要： A method and apparatus are provided for biasing a non-center tapped magneto-resistive head at a constant voltage using two separate biasing stages to provide independent control over the voltage at each of the two terminals of the head. A first control device detects the voltage at a first head terminal and directs changes to the output of a current source, interconnected with a first terminal of the head, to maintain the voltage at the first terminal at a first predetermined voltage. A second control device detects the voltage at second terminal of the head and directs changes to the input of a current sink, interconnected with the second terminal, to maintain the voltage at the second terminal at a second predetermined voltage. Each control device is interconnected to a separate reference voltage source; by appropriate selection of the voltages of the reference voltage sources, the voltages at the two head terminals and the potential across the head can be established and maintained.
摘要翻译： 提供了一种方法和装置，用于使用两个单独的偏置级来以恒定电压偏置非中心抽头磁阻头，以提供对头部的两个端子中的每个端子处的电压的独立控制。 第一控制装置检测第一头端子处的电压，并引导与头部的第一端子互连的电流源的输出的变化，以将第一端子处的电压维持在第一预定电压。 第二控制装置检测头部第二端的电压，并引导与第二端子互连的电流吸收器的输入的变化，以将第二端子处的电压维持在第二预定电压。 每个控制装置互连到单独的参考电压源; 通过适当地选择参考电压源的电压，可以建立和维护两个磁头端子处的电压和头部的电位。
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