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公开(公告)号：US06667614B1
公开(公告)日：2003-12-23
申请号：US09784782
申请日：2001-02-15
IPC分类号： G01R3312
CPC分类号： B82Y25/00 , B82Y10/00 , G01R33/07 , G11B5/00 , G11B5/012 , G11B5/3909 , G11B5/455 , G11B5/4806 , G11B11/10532 , G11B20/10527 , G11B20/1816 , G11B2005/0016
摘要： A head testing apparatus is provided for testing an output of a magnetic data recording head. The apparatus includes first and second tester input terminals for coupling to the head, first and second input stages and an AC-coupled differential amplifier. The first input stage has a first buffer input, which is coupled to the first tester input terminal, a first buffer output and a plurality of parallel-connected buffer amplifiers coupled between the first buffer input and the first buffer output. The second input stage has a second buffer input, which is coupled to the second tester input terminal, a second buffer output and a plurality of parallel-connected buffer amplifiers coupled between the second buffer input and the second buffer output. The AC-coupled differential amplifier has first and second amplefier inputs coupled to the first and second buffer outputs through first and second capacitors, respectively, and has a measurement output.
摘要翻译： 提供头部测试装置，用于测试磁数据记录头的输出。 该装置包括用于耦合到头部，第一和第二输入级的第一和第二测试仪输入端和AC耦合的差分放大器。 第一输入级具有第一缓冲器输入，其耦合到第一测试器输入端，第一缓冲器输出和耦合在第一缓冲器输入和第一缓冲器输出之间的多个并联连接的缓冲放大器。 第二输入级具有第二缓冲器输入，其耦合到第二测试器输入端，第二缓冲器输出和耦合在第二缓冲器输入和第二缓冲器输出之间的多个并联连接的缓冲放大器。 AC耦合差分放大器具有分别通过第一和第二电容器耦合到第一和第二缓冲器输出的第一和第二充足输入端，并且具有测量输出。
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公开(公告)号：US06611167B2
公开(公告)日：2003-08-26
申请号：US10252238
申请日：2002-09-23
IPC分类号： G05F302
CPC分类号： B82Y25/00 , B82Y10/00 , G01R33/07 , G11B5/00 , G11B5/012 , G11B5/3909 , G11B5/455 , G11B5/4806 , G11B11/10532 , G11B20/10527 , G11B20/1816 , G11B2005/0016
摘要： A balanced bi-directional current source is provided, which includes first and second current output terminals, a current control circuit, first and second amplifiers and first and second sense impedances. The current control circuit has a reference input, a feedback input, and a control output, which is based on the reference input and the feedback input. The first amplifier has a first amplifier input, which is coupled to the control output, and a first amplified output. The second amplifier has a second amplifier input, which is coupled to the control output, and a second amplified output, which is inverted relative to the first amplified output. The first sense impedance is coupled in series between the first amplified output and the first current output terminal and has a feedback output which is coupled to the feedback input. The second sense impedance is matched with the first impedance and is coupled in series between the second amplified output and the second current output terminal.
摘要翻译： 提供了平衡双向电流源，其包括第一和第二电流输出端子，电流控制电路，第一和第二放大器以及第一和第二检测阻抗。 电流控制电路具有参考输入，反馈输入和基于参考输入和反馈输入的控制输出。 第一放大器具有耦合到控制输出的第一放大器输入和第一放大输出。 第二放大器具有耦合到控制输出的第二放大器输入和相对于第一放大输出反相的第二放大输出。 第一感测阻抗串联耦合在第一放大输出端和第一电流输出端子之间，并具有耦合到反馈输入端的反馈输出端。 第二感测阻抗与第一阻抗匹配，并且串联耦合在第二放大输出端与第二电流输出端子之间。
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公开(公告)号：US5991698A
公开(公告)日：1999-11-23
申请号：US852434
申请日：1997-05-07
申请人： Shanlin Hao , Ray V. Rigles , William P. Wood , Lars H. Ahlen , John C. Heitke
发明人： Shanlin Hao , Ray V. Rigles , William P. Wood , Lars H. Ahlen , John C. Heitke
CPC分类号： G11B5/3103 , H01L21/00 , G11B5/1871 , G11B5/3166 , Y10T29/49004 , Y10T29/49036 , Y10T29/49037
摘要： A lapping system data acquisition unit is disclosed for use in measuring resistances of multiple resistors embedded in a structure to be machined. Each of multiple independent current sources directs a current through one of the multiple resistors embedded in the structure during machining of a surface of the structure. Each of multiple voltage sensing devices couples to a separate one of the multiple resistors and provides a separate analog voltage output signal indicative of the resistance of the resistor. Each of multiple filters is coupled to a separate one of the multiple voltage sensing devices Analog-to-digital conversion circuitry coupled to the multiple filters generates a digitized signal for each of the filtered output signals.
摘要翻译： 公开了一种研磨系统数据采集单元，用于测量嵌入在待加工结构中的多个电阻器的电阻。 多个独立电流源中的每一个在加工结构的表面期间引导电流通过嵌入结构中的多个电阻中的一个电阻。 多个电压感测装置中的每一个耦合到多个电阻器中的单独一个，并且提供指示电阻器的电阻的单独的模拟电压输出信号。 多个滤波器中的每一个耦合到多个电压感测装置中的单独的一个。耦合到多个滤波器的模数转换电路为滤波的输出信号中的每一个生成数字化的信号。
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