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1. 发明授权

US06304396B1 Arrangement for reading information from a magnetic record carrier 失效
标题翻译：从磁记录载体读取信息的安排
公开(公告)号：US06304396B1
公开(公告)日：2001-10-16
申请号：US09241013
申请日：1999-02-01
申请人： Joao N. V. L. Ramalho , Johannes O. Voorman , Patrick Leclerc , Jozef A. M. Ramaekers , Marcel L Lugthart , Johannes W.M. Bergmans
发明人： Joao N. V. L. Ramalho , Johannes O. Voorman , Patrick Leclerc , Jozef A. M. Ramaekers , Marcel L Lugthart , Johannes W.M. Bergmans
IPC分类号： G11B502
CPC分类号： G11B20/10009 , G01R33/09 , G11B5/012 , G11B5/02 , G11B5/09 , G11B7/00 , G11B20/22 , G11B33/14 , G11B2005/0016 , G11B2005/0018
摘要： An arrangement is disclosed for reading information from a record carrier. The arrangement comprises a read head having at least one magneto-resistive element (Rmr), a first transistor (Tr1) and a second transistor (Tr2). The base of the first transistor (Tr1) is coupled to the emitter of the second transistor (Tr2) via a first capacitor (6). The base of the second transistor (Tr2) is coupled to the emitter of the first transistor (Tr1) via a second capacitor (8). The arrangement further comprises a non-linear transconductance amplifier (14) having first and second inputs coupled to the output terminals (10,12) of the arrangement, and having and inverting and non-inverting outputs coupled to the bases of the first and second transistor. The non-linear transconductance amplifier (14) is adapted to supply a control current at its inverting and non-inverting outputs in response to a voltage present across its inputs, such that for first and second input voltages resulting in first and second output currents, respectively, the first input voltage being larger than the second input voltage, the amplification factor of the transconductance means being larger for generating the first output current than for generating the second output current.
摘要翻译：公开了一种用于从记录载体读取信息的装置。该装置包括具有至少一个磁阻元件（Rmr），第一晶体管（Tr1）和第二晶体管（Tr2）的读取头。第一晶体管（Tr1）的基极经由第一电容器（6）耦合到第二晶体管（Tr2）的发射极。第二晶体管（Tr2）的基极通过第二电容器（8）耦合到第一晶体管（Tr1）的发射极。该装置还包括具有耦合到该装置的输出端子（10,12）的第一和第二输入的非线性跨导放大器（14），并且具有耦合到第一和第二输入端的基极的反相和非反相输出晶体管。非线性跨导放大器（14）适于响应于跨过其输入端的电压而在其反相和非反相输出端提供控制电流，使得对于产生第一和第二输出电流的第一和第二输入电压，分别地，第一输入电压大于第二输入电压，跨导装置的放大系数比用于产生第二输出电流的产生第一输出电流大。

2. 发明授权

US06449113B1 Device for reading magnetic information 失效
标题翻译：磁信息读取装置
公开(公告)号：US06449113B1
公开(公告)日：2002-09-10
申请号：US09356597
申请日：1999-07-19
申请人： Patrick Leclerc , Eric Pieraerts , Joao N. V. L. Ramalho , Jean Barbotin , Johannes O. Voorman
发明人： Patrick Leclerc , Eric Pieraerts , Joao N. V. L. Ramalho , Jean Barbotin , Johannes O. Voorman
IPC分类号： G11B503
CPC分类号： G11B5/40 , G11B5/02 , G11B5/035 , G11B5/09 , G11B2005/0018
摘要： A device for reading magnetic information, having at least one read head including at least one magnetoresistive bar MR for generating data pulses representative of information read by the head. To enable the bar to be biased accurately without requiring a measurement of the quiescent resistance of the bar, the device includes a control loop for controlling the power dissipated in the magnetoresistive bar, the control loop having a time constant which is large with respect to the duration of the data pulses.
摘要翻译：一种用于读取磁信息的装置，具有至少一个读头，该读头包括至少一个磁阻条MR，用于产生表示头部读取的信息的数据脉冲。为了使该条精确地偏置而不需要测量棒的静态电阻，该器件包括用于控制在磁阻条中消耗的功率的控制回路，该控制回路的时间常数相对于数据脉冲的持续时间。

3. 发明授权

US06225802B1 Apparatus for automatic measurement of resistance of integrated MR device 失效
标题翻译：用于自动测量集成MR器件电阻的装置
公开(公告)号：US06225802B1
公开(公告)日：2001-05-01
申请号：US09356596
申请日：1999-07-19
申请人： Joao N. V. L. Ramalho , Gerben W. De Jong , Jozef A. M. Ramaekers , Eric Pieraerts
发明人： Joao N. V. L. Ramalho , Gerben W. De Jong , Jozef A. M. Ramaekers , Eric Pieraerts
IPC分类号： G01B714
CPC分类号： G11B5/02 , G01R27/14 , G01R33/09 , G11B5/012 , G11B5/40 , G11B5/455 , G11B19/04 , G11B2005/0018
摘要： A device for measuring the resistance of an MR element which passes a bias current Imr and which derives a bias voltage. A voltage comparator CMP receives the bias voltage Vmr and a reference voltage Vref. A counter UPCNT has an enable input EN coupled to the output of the comparator and a digital output forming the output of the device. A current source supplies the bias current Imr which represents a digital value received by the current source at its control input which is coupled to the digital output of the counter. The device enables the digital value of a resistance to be measured automatically.
摘要翻译：用于测量通过偏置电流Imr并导出偏置电压的MR元件的电阻的装置。电压比较器CMP接收偏置电压Vmr和参考电压Vref。计数器UPCNT具有耦合到比较器的输出的使能输入EN和形成器件的输出的数字输出。电流源提供偏置电流Imr，其表示在其控制输入处由电流源接收的数字值，耦合到计数器的数字输出。该器件可以自动测量电阻的数字值。

4. 发明授权

US06324028B1 Recording apparatus provided with a write driver circuit 失效
标题翻译：具有写入驱动电路的记录装置
公开(公告)号：US06324028B1
公开(公告)日：2001-11-27
申请号：US09313038
申请日：1999-05-17
申请人： Joao N. V. L. Ramalho , Johannes O. Voorman , Gerben W. De Jong , Luan Le , Eric Pieraerts
发明人： Joao N. V. L. Ramalho , Johannes O. Voorman , Gerben W. De Jong , Luan Le , Eric Pieraerts
IPC分类号： G11B502
CPC分类号： H03K17/662 , G11B5/012 , G11B5/02 , G11B5/09
摘要： A recording apparatus for recording an information signal on a magnetic record carrier includes a write driver circuit and a magnetic write head. The write driver circuit comprises a first voltage driver and a second voltage driver. A first current driver and a second current driver are present for driving the write head. The first and second voltage driver each include a respective series circuit of an npn transistor and a bidirectional impedance element coupled between a point of constant potential and the respective outputs of the first and second voltage drivers.
摘要翻译：用于在磁记录载体上记录信息信号的记录装置包括写驱动电路和磁写头。写驱动器电路包括第一电压驱动器和第二电压驱动器。存在用于驱动写入头的第一电流驱动器和第二电流驱动器。第一和第二电压驱动器各自包括npn晶体管的相应串联电路和耦合在恒定电位点与第一和第二电压驱动器的相应输出之间的双向阻抗元件。

5. 发明授权

US5568091A Differential amplifier with common-mode rejection for low supply voltages 失效
标题翻译：差分放大器，具有低电源电压的共模抑制
公开(公告)号：US5568091A
公开(公告)日：1996-10-22
申请号：US490824
申请日：1995-06-15
申请人： Joao N. V. L. Ramalho , Johannes O. Voorman
发明人： Joao N. V. L. Ramalho , Johannes O. Voorman
IPC分类号： H03F3/45
CPC分类号： H03F3/45479
摘要： A differential amplifier with common-mode rejection for low supply voltages has a first and a second differential pair without transistors in the tails of the differential pairs and with proportional common-mode currents flowing through the first and the second differential pair. The differential amplifier includes a current mirror which feeds the common-mode current of the second differential pair (3, 4) back to the output terminals of the first differential pair for the rejection of common-mode currents at the output terminals. The voltage at the output terminals of the current mirror has a d.c. level which can be established by means of a first reference voltage source independently of the common-mode voltage at the input terminals of the differential amplifier.
摘要翻译：具有用于低电源电压的共模抑制的差分放大器具有第一和第二差分对，差分对的尾部中没有晶体管，并且流过第一和第二差分对的正比共模电流。差分放大器包括电流镜，其将第二差分对（3,4）的共模电流馈送回第一差分对的输出端，用于抑制输出端的共模电流。电流镜的输出端的电压为直流电。电平，其可以通过独立于差分放大器的输入端处的共模电压的第一参考电压源建立。

6. 发明授权

US06188250B1 Peak detection apparatus 失效
公开(公告)号：US06188250B1
公开(公告)日：2001-02-13
申请号：US09229821
申请日：1999-01-13
申请人： Johannes O. Voorman , Joao N. V. L. Ramalho , Mareel L. Lugthart
发明人： Johannes O. Voorman , Joao N. V. L. Ramalho , Mareel L. Lugthart
IPC分类号： G01R1900
CPC分类号： G01R19/04
摘要： An apparatus for detecting peaks of positive and negative polarity in an information signal. The apparatus comprises a first peak detector means for detecting the positive peaks and a second peak detector for detecting the negative peaks. The first peak detector means comprises a first capacitor, and has an attack time for charging the first capacitor (32) and a decay time for discharging the first capacitor, the attack time being shorter than the decay time. The first peak detector has an output for generating an output signal (42) having a first output signal value when the first peak detector is in a charging state for charging the first capacitor and having a second output value when the first peak detector is in a non-charging state. The first peak detector maintains the first capacitor charged at a first level (Vt) during time intervals that the information signal level is below said first level, said first level being larger than the zero signal level and the first peak detector is further in the charged state when the information signal level exceeds the charging level of the first capacitor. The second peak detector means comprises a second capacitor, and has an attack time for charging the second capacitor and a decay time for discharging the second capacitor, the attack time being shorter than the decay time. The second peak detector has an output (16) for generating an output signal having a third output signal value when the second peak detector is in a charging state for charging the second capacitor and having a fourth output value when the second peak detector is in a non-charging state. The second peak detector is adapted to maintain the second capacitor charged at a second level (Vt) during time intervals that the absolute value of said information signal level is below said second level, said second level being larger than the zero signal level. The second peak detector is further in the charged state when the absolute value of the information signal level exceeds the charging level of the second capacitor.

7. 发明授权

US6137647A Automatic gain control circuit for use in detecting servo pulses for controlling the position of a read head in a hard disk drive 失效
标题翻译：自动增益控制电路，用于检测伺服脉冲，用于控制硬盘驱动器中的读头的位置
公开(公告)号：US6137647A
公开(公告)日：2000-10-24
申请号：US75679
申请日：1998-05-11
申请人： Johannes O. Voorman , Joao N. V. L. Ramalho
发明人： Johannes O. Voorman , Joao N. V. L. Ramalho
IPC分类号： G11B20/10 , G11B5/55 , G11B5/596 , G11B20/18 , G11B20/24 , G11B21/08 , G11B21/10 , H03G3/20 , H03G3/30 , G11B5/02 , G11B5/09
CPC分类号： H03G3/30 , G11B20/18 , G11B20/24 , G11B21/083 , G11B21/106 , G11B5/59622 , G11B5/553
摘要： An automatic gain control circuit, for amplifying an input signal so that it has a specific correspondence with a reference value (V.sub.ref), includes an input terminal (2) for receiving the input signal, a variable gain amplifier (4) for amplifying the input signal in response to a gain control signal, a peak detector (14) for detecting peaks in the amplified input signal, the peak detector (14) having an attack time constant (T.sub.a) and a decay time constant (T.sub.d), and supplying a peak detector output signal (V.sub.p) representative of the amplitude of the peaks in the amplified input signal, a comparator (20) for comparing the peak detector output signal (V.sub.p) with the reference value (V.sub.ref) to form an error signal (e), and an integrator (30) for integrating the error signal (e) to form the gain control signal. The peak detector includes a controller for controlling the decay time constant in response to the error signal, the controller decreasing the decay time constant for increasing error signals, in a situation when the peak detector output signal (V.sub.p) is larger than the reference value (V.sub.ref). The relationship, T.sub.d =c.multidot.T.sub.a.sup.p, is maintained between the attack time constant T.sub.a and the decay time constant T.sub.d of the peak detector, where c is a positive constant and p is a constant larger than 1. p is preferably equal to 2 and c satisfies the relation 20.ltoreq.c.ltoreq.200.
摘要翻译：一种用于放大输入信号以使其与参考值（Vref）具体特定对应关系的自动增益控制电路包括用于接收输入信号的输入端（2），用于放大输入的可变增益放大器（4）响应于增益控制信号的信号;用于检测放大的输入信号中的峰值的峰值检测器（14），具有攻击时间常数（Ta）和衰减时间常数（Td）的峰值检测器（14）用于将峰值检测器输出信号（Vp）与参考值（Vref）进行比较以形成误差信号（e）的比较器（20），其中，所述峰值检测器输出信号（Vp）以及用于积分误差信号（e）以形成增益控制信号的积分器（30）。峰值检测器包括控制器，用于响应于误差信号控制衰减时间常数，控制器在峰值检测器输出信号（Vp）大于参考值（Vp）的情况下减小增加误差信号的衰减时间常数 Vref）。在峰值检测器的攻击时间常数Ta和衰减时间常数Td之间保持关系Td = cxTap，其中c是正常数，p是大于1的常数。p优选等于2，c满足关系20

8. 发明授权

US5589777A Circuit and method for testing a disk drive head assembly without probing 失效
标题翻译：用于测试磁盘驱动器头组件而不进行探测的电路和方法
公开(公告)号：US5589777A
公开(公告)日：1996-12-31
申请号：US493384
申请日：1995-06-21
申请人： Bradley K. Davis , Johannes O. Voorman , Joao N. V. L. Ramalho , Patrice Gamand
发明人： Bradley K. Davis , Johannes O. Voorman , Joao N. V. L. Ramalho , Patrice Gamand
IPC分类号： G01R31/02 , G06F11/267 , G11B5/00 , G11B5/40 , G11B5/455 , G11B5/48 , G01R31/302
CPC分类号： G11B5/40 , G01R31/02 , G06F11/2221 , G11B5/455 , G11B2005/0016 , G11B5/4806
摘要： A preamplifier circuit for a computer data storage system disk drive read/write head (or HSA) includes multiple test modes to enable electrical testing of the preamplifier, the read/write heads, and associated circuitry without physically probing the components or circuitry. Communication between the preamplifier and a host controller provides for test mode selection and test mode enablement within the preamplifier. Testing occurs using only the normal interface connector to the head disk assembly (HDA) in which the preamplifier and HSA are embodied. Properties such as electrical resistance, ESD, preamplifier bond wire connection integrity, head bond wire and solder joint integrity, and connections from the head slider to the preamplifier leads are all tested. Testing occurs without probing to provide efficient, reliable, and cost effective manufacturing and testing benefits of the read/write heads, flex assembly, HSA, and HDA.
摘要翻译：用于计算机数据存储系统的前置放大器电路磁盘驱动器读/写头（或HSA）包括多个测试模式，以使得能够电前测试前置放大器，读/写磁头和相关联的电路，而无需物理地探测组件或电路。前置放大器和主机控制器之间的通信提供前置放大器内的测试模式选择和测试模式启用。仅使用前置放大器和HSA的头盘组件（HDA）的正常接口连接器进行测试。性能如电阻，ESD，前置放大器接合线连接完整性，头接合线和焊点完整性，以及从头滑块到前置放大器引线的连接都经过测试。测试发生在无需提供读写头，Flex组件，HSA和HDA的高效，可靠且具有成本效益的制造和测试优势。

9. 发明授权

US5619386A Arrangement for reading information from a track on a record carrier comprising a fast settling read amplifier for magneto-resistive heads 失效
标题翻译：用于从包括用于磁阻头的快速建立读取放大器的记录载体上的轨道读取信息的装置
公开(公告)号：US5619386A
公开(公告)日：1997-04-08
申请号：US318420
申请日：1994-10-05
申请人： Johannes O. Voorman , Joao N. V. L. Ramalho
发明人： Johannes O. Voorman , Joao N. V. L. Ramalho
IPC分类号： G01R33/09 , G11B5/00 , G11B5/02 , G11B5/027 , G11B5/39 , G11B19/04 , H03F3/193 , G11B5/03 , H03F21/00
CPC分类号： H03F3/1935 , G01R33/09 , G11B19/04 , G11B5/02 , G11B2005/0016 , G11B2005/0018 , G11B5/39
摘要： An arrangement for reading out an information signal from a magnetic record carrier. The arrangement includes a read head having a magneto-resistive (MR) element (R.sub.m1) with a first terminal (3) connected to a first point (13) of constant potential, and a second terminal (4); a bias-current generator (2) having an output (5) for supplying a bias-current to the MR element; and an amplifier circuit (1) having a first terminal (6) coupled to the output (5) of the bias-current generator (2), and a second terminal (7) coupled to the second terminal (4) of the magneto-resistive element (R.sub.m1) so as to form a series arrangement of the bias-current generator, the amplifier circuit and the magneto-resistive element. At an output terminal (8), the information signal is available. The amplifier circuit (1) includes a MOS transistor T.sub.1 coupled between the output terminal (8) and the second terminal (7), and a feedback circuit, including a resistor (R.sub.1) and a capacitor (C.sub.1), having a low cut-off frequency (R.sub.1,C.sub.1) which provides a bias voltage to the gate of the MOS transistor (T.sub.1) and forces the bias-current of the bias-current generator (2) to flow through the MR element. Fast settling of the arrangement is possible by short-circuiting, via a switch (S.sub.1), the resistor (R.sub.1), a high charge current for capacitor C.sub.1 being supplied by a buffer amplifier (310). The buffer amplifier (310), the resistor R.sub.1 and the switch S.sub.1 provide fast settling without generating undesired off-set.
摘要翻译：用于从磁记录载体读出信息信号的装置。该装置包括具有连接到恒定电位的第一点（13）的第一端子（3）和第二端子（4）的具有磁阻（MR）元件（Rm1）的读取头。具有用于向MR元件提供偏置电流的输出（5）的偏置电流发生器（2）以及具有耦合到所述偏置电流发生器（2）的输出（5）的第一端子（6）的放大器电路（1）和耦合到所述偏磁电流发生器（2）的第二端子（4）的第二端子（7）电阻元件（Rm1），以形成偏置电流发生器，放大器电路和磁阻元件的串联布置。在输出端（8），信息信号可用。放大器电路（1）包括耦合在输出端子（8）和第二端子（7）之间的MOS晶体管T1和包括电阻器（R1）和电容器（C1）的反馈电路，关闭频率（R1，C1），其向MOS晶体管（T1）的栅极提供偏置电压，并且迫使偏置电流发生器（2）的偏置电流流过MR元件。可以通过开关（S1）短路电阻器（R1），通过缓冲放大器（310）提供的用于电容器C1的高充电电流来快速建立安排。缓冲放大器（310），电阻器R1和开关S1提供快速建立而不产生非期望的偏移。

10. 发明授权

US5559646A Balanced arrangement for reading information from a track on a record carrier which arrangement includes amplifier circuits containing cut-off capacitors which are cross-coupled to reduce noise 失效
标题翻译：用于从记录载体上的轨道读取信息的平衡布置，其包括具有交叉耦合以减少噪声的截止电容器的放大器电路
公开(公告)号：US5559646A
公开(公告)日：1996-09-24
申请号：US318302
申请日：1994-10-05
申请人： Johannes O. Voorman , Joao N. V. L. Ramalho
发明人： Johannes O. Voorman , Joao N. V. L. Ramalho
IPC分类号： G01R33/09 , G11B5/00 , G11B5/02 , G11B5/027 , G11B5/39 , H03F3/193
CPC分类号： G11B5/02 , H03F3/1935 , G11B2005/0016
摘要： An arrangement for reading out an information signal from a magnetic record carrier. The arrangement includes a read head having a magneto-resistive element with a first terminal connected to a first point of constant potential, and a second terminal; a bias-current generator having an output for supplying a bias-current to the MR element and an amplifier circuit having a first terminal coupled to the output of the bias-current generator, and a second terminal coupled to the second terminal of the MR so as to form a series arrangement of the bias-current generator, the amplifier circuit and the MR element. At an output terminal of the amplifier circuit, the information signal is available. The amplifier circuit includes a MOS transistor connected between the output terminal and the second terminal; and a feedback circuit, including a resistor and a capacitor, having a low cut-off frequency which provides a bias voltage to the gate of the MOS transistor and forces the entire bias-current of the bias-current generator to flow through the MR element The arrangement is balanced with an additional MR element (optional), bias-current generator and amplifier circuit, which are substantially the same as the MR element, bias-current generator and amplifier circuit, respectively, with the cut-off capacitors of the two individual amplifiers being cross-coupled to reduce noise.
摘要翻译：用于从磁记录载体读出信息信号的装置。该装置包括一个具有一个具有连接到第一个恒定电位点的第一端子和一个第二端子的磁阻元件的读取头; 具有用于向MR元件提供偏置电流的输出的偏置电流发生器和具有耦合到偏置电流发生器的输出的第一端子的放大器电路以及耦合到MR的第二端子的第二端子以形成偏置电流发生器，放大器电路和MR元件的串联布置。在放大器电路的输出端，信息信号可用。放大电路包括连接在输出端和第二端之间的MOS晶体管; 以及具有低截止频率的电阻器和电容器的反馈电路，其向MOS晶体管的栅极提供偏置电压，并迫使偏置电流发生器的整个偏置电流流过MR元件该布置与另外的MR元件（可选），偏置电流发生器和放大器电路平衡，其分别与MR元件，偏置电流发生器和放大器电路基本相同，其中两个截止电容器单个放大器交叉耦合以减少噪声。

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