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1. 发明授权

US5103353A Low noise amplifier with short circuit protection for signals from magnetoresistive element 失效
标题翻译：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
申请人： Stephen A. Jove , Klaas B. Klaassen , Calvin S. Nomura , Jacobus C. Leonardus van Peppen
发明人： Stephen A. Jove , Klaas B. Klaassen , Calvin S. Nomura , Jacobus C. Leonardus van Peppen
IPC分类号： G11B5/02 , G01R33/09 , G11B5/00 , G11B5/39 , G11B5/40
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.

2. 发明授权

US5323278A Low noise amplifier circuit for magnetoresistive sensors for fast read-write switching in low supply voltage applications 失效
标题翻译：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
申请人： John T. Contreras , Stephen A. Jove , Klaas B. Klaassen , Jacobus C. Leonardus van Peppen
发明人： John T. Contreras , Stephen A. Jove , Klaas B. Klaassen , Jacobus C. Leonardus van Peppen
IPC分类号： G01R33/09 , G11B5/00 , G11B5/02 , G11B33/12 , G11B5/127 , G11B5/33
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。

3. 发明授权

US5296975A High-transition-rate, low-supply-voltage write driver circuitry for magnetic inductive write head 失效
标题翻译：用于磁感应写头的高转换速率低电压写驱动电路
公开(公告)号：US5296975A
公开(公告)日：1994-03-22
申请号：US958635
申请日：1992-10-09
申请人： John T. Contreras , Stephen A. Jove , Klaas B. Klassen , Jacobus C. Leonardus van Peppen
发明人： John T. Contreras , Stephen A. Jove , Klaas B. Klassen , Jacobus C. Leonardus van Peppen
IPC分类号： G11B5/00 , G11B5/012 , G11B5/09 , G11B5/40 , G11B5/02 , G11B15/12
CPC分类号： G11B5/022 , G11B5/012 , G11B5/09 , G11B5/40 , G11B2005/0013
摘要： Writing of data on a storage disk by an inductive magnetic transducer is modulated by write driver circuitry that includes a supply voltage as low as three volts provided by a source referenced to ground, and a bias current source connected to either the supply voltage source or ground. Two bias control switches respectively direct the bias current to one or the other of two current gain circuits according to whether a positive or a negative input terminal has a preselected polarity. The gain circuits selectively respond to the bias currents supplied by the associated control switch for amplifying the bias current to remove a write current from a respective associated terminal of the transducer. Two current source switches connected to a respective one of the input terminals and to a respective one of the terminals of the transducer selectively allow and prevent the write current from flowing into the respective associated terminal of the transducer depending upon which of the input terminals has the preselected polarity. When data is not being written by the transducer, a controllable reference voltage circuit maintains the transducer at a potential at least as negative as ground to prevent electro-erosion of the transducer; and this circuit also is preferably connected to both gain circuits to prevent them from saturating.
摘要翻译：由感应式磁换能器在存储盘上写入数据由写入驱动器电路调制，该驱动器电路包括由参考地的源提供的低至三伏的电源电压，以及连接到电源电压源或接地的偏置电流源。两个偏置控制开关根据正或负输入端子是否具有预选极性，分别将偏置电流引导到两个电流增益电路中的一个或另一个。增益电路选择性地响应由相关联的控制开关提供的偏置电流，用于放大偏置电流以从换能器的相应相关联的端子去除写入电流。连接到相应的一个输入端子和换能器的相应一个端子的两个电流源开关选择性地允许和防止写入电流流入换能器的相关联的端子，这取决于哪个输入端子具有预选极性。当数据未被换能器写入时，可控参考电压电路将换能器保持至少与地面一样的电位，以防止换能器的电蚀; 并且该电路也优选地连接到两个增益电路以防止它们饱和。

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