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1. 发明授权

US06870696B2 CMOS low-noise MR read head pre-amplifier circuit 有权
标题翻译： CMOS低噪声MR读头前置放大器电路
公开(公告)号：US06870696B2
公开(公告)日：2005-03-22
申请号：US10041796
申请日：2002-01-07
申请人： Wayne L. Cheung , Stephen A. Jove
发明人： Wayne L. Cheung , Stephen A. Jove
IPC分类号： G11B5/00 , G11B5/012 , G11B5/02 , G11B5/09
CPC分类号： G11B5/02 , G11B5/012 , G11B2005/0016
摘要： A preamplifier system is provided for use with a magneto-resistive (MR) sensor. Included is an alternating current (AC) coupling module connected to the MR sensor for blocking a direct current (DC) voltage associated with an input signal, and filtering low frequency noise associated with the input signal. Also provided is a gain stage module coupled to the AC coupling module. The gain stage module includes a plurality of cascode field effect transistors (FETs) configured for amplifying the input signal, while reducing intrinsic noise and increasing operational bandwidth. Coupled to the gain stage module is a control circuit for feeding back an output of the gain stage module for bias regulation and disturbance rejection.
摘要翻译：提供了一种用于磁阻（MR）传感器的前置放大器系统。包括连接到MR传感器的交流（AC）耦合模块，用于阻断与输入信号相关联的直流（DC）电压，以及滤除与输入信号相关的低频噪声。还提供了耦合到AC耦合模块的增益级模块。增益级模块包括配置用于放大输入信号的多个共源共栅场效应晶体管（FET），同时减少固有噪声并增加操作带宽。耦合到增益级模块的是用于反馈增益级模块的输出用于偏置调节和干扰抑制的控制电路。

2. 发明授权

US5270882A Low-voltage, low-power amplifier for magnetoresistive sensor 失效
标题翻译：用于磁阻传感器的低电压，低功率放大器
公开(公告)号：US5270882A
公开(公告)日：1993-12-14
申请号：US914278
申请日：1992-07-15
申请人： Stephen A. Jove , Klaas B. Klaassen , Jacobus C. L. van Peppen
发明人： Stephen A. Jove , Klaas B. Klaassen , Jacobus C. L. van Peppen
IPC分类号： G11B5/00 , G11B5/012 , G11B5/02 , G11B5/11 , G11B5/39 , G11B5/40 , G11B5/55 , G11B19/02 , G11B19/04 , G11B23/50 , G11B33/00 , G11B33/14 , H03F3/04 , H03F3/195
CPC分类号： H03F3/195 , G11B19/04 , G11B23/505 , G11B33/1493 , G11B5/012 , G11B5/02 , G11B5/11 , G11B5/40 , G11B19/02 , G11B2005/0016 , G11B2005/0018 , G11B5/553 , H03F2200/372
摘要： Low noise, low power, low voltage amplifier circuits with a single ended input having no common mode rejection for concurrently biasing and amplifying signals generated by magnetoresistive (MR) elements in a disk file. The amplifier circuits comprise a single (grounded) supply voltage source. One terminal of each MR element and the conductive substrate of each MR element and the conductive substrate of each disk in the disk file are grounded to minimize transient conductive asperity currents. The head/disk assembly of the disk file is completely enclosed by a highly conductive electrostatically shielded metallic enclosure that operates as a Faraday cage and isolates leads connecting the MR elements with the amplifier circuit from large, fast rise/fall time voltage transients.

3. 发明授权

US4420776A PSK Modulation in AC bias data recording 失效
标题翻译：交流偏压数据记录中的PSK调制
公开(公告)号：US4420776A
公开(公告)日：1983-12-13
申请号：US325711
申请日：1981-11-30
申请人： Stephen A. Jove , Julian E. Vaughn
发明人： Stephen A. Jove , Julian E. Vaughn
IPC分类号： G11B5/09 , G11B5/03
CPC分类号： G11B5/03
摘要： In a data recording system employing an AC bias signal that is superimposed on the data signal, the AC bias signal is phase modulated to compensate for the difference in the phase angle between the alternating bias and the data signals. The frequency of the AC bias signal is no greater than ten times the frequency of the data signal.
摘要翻译：在采用叠加在数据信号上的AC偏置信号的数据记录系统中，AC偏置信号被相位调制以补偿交流偏压和数据信号之间的相位角的差异。 AC偏置信号的频率不大于数据信号频率的十倍。

4. 发明授权

US5204789A Low noise voltage-biasing amplifier for magnetoresistive element 失效
标题翻译：用于磁电元件的低噪声电压偏置放大器
公开(公告)号：US5204789A
公开(公告)日：1993-04-20
申请号：US648675
申请日：1991-01-13
申请人： Stephen A. Jove , Charles R. Nielsen , Calvin S. Nomura , Michael L. Workman
发明人： Stephen A. Jove , Charles R. Nielsen , Calvin S. Nomura , Michael L. Workman
IPC分类号： H01L43/00 , G01R33/09 , G11B5/02 , G11B5/40 , H03F1/52
CPC分类号： G11B5/40 , G01R33/09 , G11B5/02
摘要： A circuit for concurrently producing low noise electrical output signals which are amplified representations of signals produced by a magnetoresistive (MR) element and protecting said element from electrical short circuits which can occur between said element and its environment. A first feedback loop comprises (a) an input amplifier for amplifying a signal current from the MR element and (b) a source of bias current for biasing the MR element with a bias voltage. An input amplifier is concurrently biased by said current and amplifies a signal current from the MR element for producing a circuit output signal corresponding to dRh/RhRh and in which any differential direct current (dc) output offset error is minimized. (RhRh is the square of the time-averaged resistance of the MR element and dRh is the magnetic-signal-induced change in the resistance of the MR element.) A second feedback loop, electrically in series with the first feedback loop, biases the MR element toward a preselected reference potential and concurrently prevents flow of a current sufficient to damage the MR element in the event of a short circuit occurring between the MR element and its environment (e.g. the recording surface of a magnetic recording disk).

5. 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.

6. 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。

7. 发明授权

US4914398A Method and circuitry to suppress additive disturbances in data channels containing MR sensors 失效
标题翻译：抑制包含MR传感器的数据通道中的附加扰动的方法和电路
公开(公告)号：US4914398A
公开(公告)日：1990-04-03
申请号：US226634
申请日：1988-08-01
申请人： Stephen A. Jove , Klaas B. Klaassen , Jacobus C. L. van Peppen
发明人： Stephen A. Jove , Klaas B. Klaassen , Jacobus C. L. van Peppen
IPC分类号： G11B5/09 , G11B5/00 , G11B5/012 , G11B5/02 , G11B5/40 , G11B19/04 , G11B20/00 , G11B20/22 , G11B33/10
CPC分类号： G11B5/02 , G11B20/00 , G11B20/22 , G11B5/012 , G11B5/40 , G11B19/04 , G11B2005/0016 , G11B33/10
摘要： A method and circuitry are disclosed for suppressing additive transient disturbances in a data channel; e.g., due to thermal transients caused by an MR transducer contacting moving a storage surface. Positive and negative envelope detectors each have their inputs connected to the channel, and provide respective outputs which are summed and contain an envelope component and a residue component. A buffer interconnects the detectors to allow both detectors to follow rapid positive excursions of the data channel signal. A nonlinear signal-adaptive filter is connected to the summed output to further reduce the residue component. The data channel signal (or preferably the output from a delay means connected to the channel) is summed with the output from the filter. The relative amplitudes of these two outputs is set such that the resulting summed output signal is free of additive disturbances.

8. 发明授权

US4879610A Protective circuit for a magnetoresistive element 失效
标题翻译：用于磁阻元件的保护电路
公开(公告)号：US4879610A
公开(公告)日：1989-11-07
申请号：US250784
申请日：1988-09-28
申请人： Stephen A. Jove , Klaas B. Klaassen , Calvin S. Nomura , Jacobus C. L. vanPeppen
发明人： Stephen A. Jove , Klaas B. Klaassen , Calvin S. Nomura , Jacobus C. L. vanPeppen
IPC分类号： G11B5/39 , G11B5/00 , G11B5/02 , G11B5/40 , G11B19/04 , H03F3/72
CPC分类号： H03F3/72 , G11B19/04 , G11B5/02 , G11B5/40 , G11B2005/0018
摘要： A protective circuit for a magnetoresistive (MR) element having a first and a second terminal in which a first current source is coupled to the first terminal of the MR element to produce a bias current through the MR element and a second current source is coupled to the second terminal of the MR element to produce a reference current. Circuit means coupled across the MR element senses the center potential of the MR element substantially midway between the first and second terminals, and a feedback circuit responsive to the sensed center potential is coupled to adjust the current output of the first current source to maintain the center potential to a selected reference voltage to protect the MR element from short circuits to a conductive area of the magnetic recording medium. A second feedback circuit is provided which comprises a pair of transistors coupled in a differential pair configuration and a transconductance stage which feeds back a signal as a current to the transistors which keeps the dc currents through each of the transistors equal, and the transistors provide an amplified output signal which is a function of the magnetic flux being sensed by the MR element.
摘要翻译：一种用于具有第一和第二端子的磁阻（MR）元件的保护电路，其中第一电流源耦合到MR元件的第一端，以产生通过MR元件的偏置电流，而第二电流源耦合到 MR元件的第二个端子产生参考电流。耦合在MR元件上的电路装置基本上在第一和第二端子之间感测到MR元件的中心电位，并且响应于感测的中心电位的反馈电路被耦合以调整第一电流源的电流输出以维持中心电位到所选择的参考电压，以保护MR元件免受短路到磁记录介质的导电区域。提供了第二反馈电路，其包括以差分对配置耦合的一对晶体管和跨导级，其将作为电流的信号作为电流反馈到晶体管，晶体管保持通过每个晶体管的直流电流相等，并且晶体管提供放大的输出信号，其是由MR元件感测的磁通量的函数。

9. 发明授权

US4706138A Amplification of signals produced by a magnetic sensor 失效
标题翻译：由磁传感器产生的信号的放大
公开(公告)号：US4706138A
公开(公告)日：1987-11-10
申请号：US851649
申请日：1986-04-14
申请人： Stephen A. Jove , Klaas B. Klaassen
发明人： Stephen A. Jove , Klaas B. Klaassen
IPC分类号： G01R33/09 , G11B5/00 , G11B5/02 , G11B19/02 , G11B5/127
CPC分类号： G11B5/02 , G01R33/09 , G11B19/02 , G11B2005/0016
摘要： A transimpedance amplifier for biasing and amplifying the signals produced by a magnetoresistive element is provided. Electrically, the resistance of the element is disposed as degenerative feedback in the emitter circuit of a differential pair comprising the input stage of the amplifier. Bias current for the element is supplied by the same current source that supplies current to the differential pair. 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 variations transistor characteristics and the steady-state value of the magnetoresistive element. The amplified signal, representing .DELTA.R.sub.h /R.sub.h, is sensed as a current through the magnetoresistive element, where .DELTA.R.sub.h is the change in steady-state resistance, R.sub.h, of the element.

10. 发明授权

US5523898A Partial MR sensor bias current during write 失效
标题翻译：写入时部分MR传感器偏置电流
公开(公告)号：US5523898A
公开(公告)日：1996-06-04
申请号：US336611
申请日：1994-11-08
申请人： Stephen A. Jove , Albert J. Wallash
发明人： Stephen A. Jove , Albert J. Wallash
IPC分类号： G11B5/00 , G11B5/02 , G11B5/03 , G11B5/09 , G11B5/127
CPC分类号： G11B5/02 , G11B2005/0008 , G11B2005/0018
摘要： In a magnetoresistive read/inductive write magnetic transducer, magnetic stability of the magnetoresistive read sensor is improved by reducing the bias current to the magnetoresistive read sensor to a predetermined value during a period when a write current signal is applied to the inductive write head. The reduced bias current is greater than zero, but less than that required for reading data stored in a magnetic storage media. The reduced bias current is about 30% of the full bias current applied during the read operation of the magnetoresistive head.
摘要翻译：在磁阻读/感应式写磁换能器中，通过在将写入电流信号施加到电感写入头的期间将磁阻读取传感器的偏置电流减小到预定值来改善磁阻读取传感器的磁稳定性。减小的偏置电流大于零，但小于读取存储在磁存储介质中的数据所需的偏置电流。减小的偏置电流是在磁阻磁头的读取操作期间施加的全偏置电流的约30％。

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