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公开(公告)号：US20080088982A1
公开(公告)日：2008-04-17
申请号：US11549879
申请日：2006-10-16
IPC分类号： G11B5/33
CPC分类号： G11B5/3993
摘要： Magnetic sensing chips and methods of fabricating the magnetic sensing chips are disclosed. A magnetic sensing chip as described herein includes an EMR sensor formed on a substrate from multiple semiconductor layers. One or more of the semiconductor layers form a quantum well comprising a two-dimensional electron gas (2DEG) or hole gas (2DHG). The magnetic sensing chip also includes one or more transistors formed on the substrate from the multiple semiconductor layers. The transistor(s) likewise include a quantum well comprising a 2DEG or 2DHG. The EMR sensor and the transistor(s) are connected by one or more connections so that the transistor(s) amplifies data signals from the EMR sensor.
摘要翻译： 公开了磁感测芯片和制造磁感测芯片的方法。 如本文所述的磁传感芯片包括形成在来自多个半导体层的衬底上的EMR传感器。 一个或多个半导体层形成包含二维电子气（2DEG）或空穴气体（2DHG）的量子阱。 磁感测芯片还包括从多个半导体层形成在衬底上的一个或多个晶体管。 晶体管同样包括包含2DEG或2DHG的量子阱。 EMR传感器和晶体管通过一个或多个连接连接，使得晶体管放大来自EMR传感器的数据信号。
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公开(公告)号：US08059373B2
公开(公告)日：2011-11-15
申请号：US11549879
申请日：2006-10-16
IPC分类号： G11B5/33
CPC分类号： G11B5/3993
摘要： Magnetic sensing chips and methods of fabricating the magnetic sensing chips are disclosed. A magnetic sensing chip as described herein includes an EMR sensor formed on a substrate from multiple semiconductor layers. One or more of the semiconductor layers form a quantum well comprising a two-dimensional electron gas (2DEG) or hole gas (2DHG). The magnetic sensing chip also includes one or more transistors formed on the substrate from the multiple semiconductor layers. The transistor(s) likewise include a quantum well comprising a 2DEG or 2DHG. The EMR sensor and the transistor(s) are connected by one or more connections so that the transistor(s) amplifies data signals from the EMR sensor.
摘要翻译： 公开了磁感测芯片和制造磁感测芯片的方法。 如本文所述的磁传感芯片包括形成在来自多个半导体层的衬底上的EMR传感器。 一个或多个半导体层形成包含二维电子气（2DEG）或空穴气体（2DHG）的量子阱。 磁感测芯片还包括从多个半导体层形成在衬底上的一个或多个晶体管。 晶体管同样包括包含2DEG或2DHG的量子阱。 EMR传感器和晶体管通过一个或多个连接连接，使得晶体管放大来自EMR传感器的数据信号。
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公开(公告)号：US5521896A
公开(公告)日：1996-05-28
申请号：US446368
申请日：1995-05-22
申请人： Christopher H. Bajorek , Thomas W. Glaser , Klaas B. Klaassen , Charles R. Nielsen , George R. Santana , Gordon J. Smith , David A. Thompson , Michael L. Workman
发明人： Christopher H. Bajorek , Thomas W. Glaser , Klaas B. Klaassen , Charles R. Nielsen , George R. Santana , Gordon J. Smith , David A. Thompson , Michael L. Workman
CPC分类号： G06F1/3215 , G06F1/3268 , G11B19/00 , G11B19/20 , Y02B60/1246
摘要： A disk drive power manager that compares energy usage with a predetermined profile to select one of several reduced-power operating modes. An energy usage register is updated at regular intervals according to the energy used during each time interval. An attenuated average energy usage value is obtained by attenuating the energy usage measures over time and integrating the results. The average energy level is compared with several predetermined energy threshold profiles to select a full- or reduced-power operating mode. Operating mode selection automatically adapts to the usage pattern to optimally balance power consumption with operational accessibility.
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4.发明授权Low noise amplifier circuit for magnetoresistive sensors for fast read-write switching in low supply voltage applications 失效用于低电压应用中快速读写开关的磁阻传感器的低噪声放大器电路
公开(公告)号：US5323278A
公开(公告)日：1994-06-21
申请号：US946208
申请日：1992-09-17
CPC分类号： G11B33/122 , G01R33/09 , G11B5/00 , G11B5/02 , G11B2005/0016 , G11B2005/0018
摘要： A data storage system comprises magnetoresistive (MR) sensing elements for sensing data from a recording medium that is referenced to ground, and an amplifier circuit including a biasing stage, an amplifying stage, and a matching stage, each referenced to a common supply voltage source and to ground. The biasing stage includes a reference current source for selectively biasing each MR element with a constant current and, in so doing, developing a single-ended voltage signal having a first dc component. The amplifying stage converts the single-ended voltage signal into an amplified single-ended output voltage signal having a second dc component but in which the first dc component is eliminated. The matching stage creates a bias and imposes said bias on the amplifying stage for converting the single-ended output voltage signal to a differential output voltage signal in which the second dc component is eliminated.
摘要翻译： 数据存储系统包括磁阻（MR）感测元件，用于感测来自参考地的记录介质的数据;以及放大器电路，其包括偏置级，放大级和匹配级，每个参考公共电源电压源 和地面。 偏置级包括用于以恒定电流选择性地偏置每个MR元件的参考电流源，并且在这样做时，开发具有第一直流分量的单端电压信号。 放大级将单端电压信号转换成具有第二直流分量的放大的单端输出电压信号，其中第一直流分量被消除。 匹配级产生偏置并且在放大级上施加所述偏置，用于将单端输出电压信号转换成消除第二直流分量的差分输出电压信号。
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公开(公告)号：US5032935A
公开(公告)日：1991-07-16
申请号：US449686
申请日：1989-12-12
申请人： Stephen A. Jove , Klaas B. Klaassen , Long Tran
发明人： Stephen A. Jove , Klaas B. Klaassen , Long Tran
摘要： A circuit for producing a signal whose magnitude is a chosen amplitude compensation characteristic of the signals produced by a magnetoresistive (MR) element comprising an input stage which produces an amplified output signal which is coupled to the output stage, and control signals proportional to the resistance of the MR element and inversely proportional to the resistance of the MR element which are coupled to a feedforward circuit. The feedforward circuit generates a chosen amplitude equalization characteristic of the signals coupled to the feedforward circuit, and this signal is coupled to a bias terminal of the output stage so that the output stage produces a signal representing the chosen amplitude compensation characteristic of the signals produced by the MR element.
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6.发明授权Voltage amplifier for constant voltage biasing and amplifying signals from a MR sensor 失效用于恒定电压偏置和放大来自MR传感器的信号的电压放大器
公开(公告)号：US4786993A
公开(公告)日：1988-11-22
申请号：US880419
申请日：1986-06-30
CPC分类号： G01R33/09 , G11B5/02 , G11B2005/0016
摘要： An amplifier for voltage biasing and amplifying the signals produced by a magnetic sensor is provided. Electrically, the resistance of the sensor is disposed between the bases of a differential pair comprising the input stage of the amplifier. Constant bias voltage for the sensor is provided independently of sensor resistance. DC feedback to the input stage balances current flow in both paths of the differential input stage to correct for DC offset arising in the output from input stage emitter resistor. The amplified signal, representing .DELTA.R.sub.h /R.sub.h, is sensed as a voltage across the magnetoresistive sensor, where .DELTA.R.sub.h is the change in steady-state resistance, R.sub.h, of the sensor.
摘要翻译： 提供了用于对由磁传感器产生的信号进行电压偏置和放大的放大器。 电气地，传感器的电阻设置在包括放大器的输入级的差分对的基极之间。 独立于传感器电阻提供传感器的恒定偏置电压。 到输入级的直流反馈平衡差分输入级两路径中的电流，以校正输入级发射极电阻输出中产生的直流偏移。 表示DELTA Rh / Rh的放大信号被感测为磁阻传感器两端的电压，其中DELTA Rh是传感器的稳态电阻Rh的变化。
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公开(公告)号：US5544138A
公开(公告)日：1996-08-06
申请号：US548350
申请日：1995-11-01
申请人： Christopher H. Bajorek , Thomas W. Glaser , Klaas B. Klaassen , Charles R. Nielsen , George R. Santana , Gordon J. Smith , David A. Thompson , Michael L. Workman
发明人： Christopher H. Bajorek , Thomas W. Glaser , Klaas B. Klaassen , Charles R. Nielsen , George R. Santana , Gordon J. Smith , David A. Thompson , Michael L. Workman
CPC分类号： G06F1/3215 , G06F1/3268 , G11B19/00 , G11B19/20 , Y02B60/1246
摘要： A disk drive power manager that compares energy usage with a predetermined profile to select one of several reduced-power operating modes. An energy usage register is updated at regular intervals according to the energy used during each time interval. An attenuated average energy usage value is obtained by attenuating the energy usage measures over time and integrating the results. The average energy level is compared with several predetermined energy threshold profiles to select a full- or reduced-power operating mode. Operating mode selection automatically adapts to the usage pattern to optimally balance power consumption with operational accessibility.
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8.发明授权Low noise amplifier with short circuit protection for signals from magnetoresistive element 失效低噪声放大器，具有短路电路保护功能，用于信号元件的信号
公开(公告)号：US5103353A
公开(公告)日：1992-04-07
申请号：US517093
申请日：1990-05-01
CPC分类号： G11B5/40 , G01R33/09 , G11B2005/0016
摘要： An amplifier circuit is disclosed for simultaneously producing electrical output signals whose magnitude is representative of signals produced by a magnetoresistive (MR) element and protecting said MR element from electrical short circuits between said element and its environment. A means including a first feedback loop biases the MR element with a bias current and amplifies a signal current for causing the MR element to produce a circuit output signal corresponding to dRh/Rh and in which any dc offset error is minimized. Rh is the resistance of the MR element and dRh is the magnetic-signal-induced change in the resistance of the MR element. A second feedback loop insures that the MR element is held at a preselected reference potential and concurrently insures that no current will flow sufficient to damage the element in event of a short circuit between the element and its environment. The feedback loops are interconnected by outputs of the respective feedback loops being commonly connected to the bases of a pair of input bipolar transistors, whose respective emitters are connected to opposite terminals of the MR element.
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9.发明授权Method and apparatus for in-situ measurement of head/recording medium clearance 失效用于原位测量头/记录介质间隙的方法和装置
公开(公告)号：US4777544A
公开(公告)日：1988-10-11
申请号：US897180
申请日：1986-08-15
申请人： Byron R. Brown , Hung L. Hu , Klaas B. Klaassen , Joseph J. Lum , Jacobus C. L. Van Peppen , Walter E. Weresin
发明人： Byron R. Brown , Hung L. Hu , Klaas B. Klaassen , Joseph J. Lum , Jacobus C. L. Van Peppen , Walter E. Weresin
CPC分类号： G11B5/012 , G11B27/36 , G11B5/6029 , G11B2005/001 , G11B2005/0013
摘要： A method and apparatus for measuring the flying height of a slider supporting a magnetic transducer in-situ in a direct manner in an operational magnetic disk storage system. The method and apparatus produce relative motion between the magnetic transducer and a magnetic recording medium at a first velocity so that the resulting air bearing positions the magnetic transducer slider at a first flying height from the magnetic medium. A single signal of constant periodicity is written over a predetermined area of the recording medium by the magnetic transducer, and a readback signal is sensed from the predetermined area of the recording medium to produce a first signal. The flying height of the magnetic transducer slider is lowered to substantially zero, and a readback signal is sensed at the lowered flying height to produce a second signal. The first flying height is then calculated as the ratio, expressed in decibels, of the first and second signals times the wavelength divided by a constant. In an alternate embodiment a plurality of signals are recorded and readback signals are simultaneously sensed at two separate wavelengths. In a further embodiment, a signal is recorded which has a spectral content comprising a plurality of different frequencies, and readback signals are simultaneously sensed at two separate wavelengths.
摘要翻译： 一种用于在操作磁盘存储系统中以直接方式现场测量支撑磁换能器的滑块的飞行高度的方法和装置。 所述方法和装置以第一速度在磁换能器和磁记录介质之间产生相对运动，使得所得到的空气轴承将磁换能器滑块定位在距离磁介质的第一飞行高度。 通过磁换能器将恒定周期性的单个信号写入记录介质的预定区域，并且从记录介质的预定区域感测回读信号以产生第一信号。 磁换能器滑块的飞行高度降低到基本为零，并且在降低的飞行高度处感测回读信号以产生第二信号。 然后以第一和第二信号乘以波长除以常数的比率（以分贝表示）计算第一飞行高度。 在替代实施例中，记录多个信号，并且以两个分开的波长同时感测回读信号。 在另一实施例中，记录信号，其具有包括多个不同频率的频谱内容，并且在两个分开的波长下同时感测回读信号。
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公开(公告)号：US4390911A
公开(公告)日：1983-06-28
申请号：US259269
申请日：1981-04-30
申请人： Klaas B. Klaassen
发明人： Klaas B. Klaassen
CPC分类号： H03K5/02 , G11B5/58 , G11B5/5965
摘要： A servo system provides track following servo information from a buried servo layer disposed under the data recording layer, using the same transducer for simultaneously reading the servo information and writing data. To prevent the voltage generated in the transducer while writing data from masking out the servo information, a dummy voltage having the same magnitude as the transducer voltage is connected so that it cancels the write data voltage in the head.
摘要翻译： 伺服系统从设置在数据记录层下方的掩埋伺服层提供跟踪跟踪伺服信息，使用相同的换能器同时读取伺服信息和写入数据。 为了防止在扫描伺服信息的同时写入数据时在传感器中产生的电压，连接具有与换能器电压相同大小的虚拟电压，从而抵消头部中的写入数据电压。
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